Awesome-Selfhosted

Self-hosting is the practice of hosting and managing applications on your own server(s) instead of consuming from SaaSS providers.

This is a list of Free Software network services and web applications which can be hosted on your own server(s). Non-Free software is listed on the Non-Free page.

See Contributing.

Table of contents

• Software
  • Analytics
  • Archiving and Digital Preservation (DP)
  • Automation
  • Blogging Platforms
  • Booking and Scheduling
  • Bookmarks and Link Sharing
  • Calendar & Contacts
  • Calendar & Contacts - CalDAV or CardDAV Servers
  • Calendar & Contacts - CalDAV or CardDAV Web-based Clients
  • Communication
  • Communication - Custom Communication Systems
  • Communication - Email
  • Communication - Email - Complete Solutions
  • Communication - Email - Mail Delivery Agents
  • Communication - Email - Mail Transfer Agents
  • Communication - Email - Mailing Lists and Newsletters
  • Communication - Email - Webmail Clients
  • Communication - IRC
  • Communication - SIP
  • Communication - Social Networks and Forums
  • Communication - XMPP
  • Communication - XMPP - Servers
  • Communication - XMPP - Web Clients
  • Community-Supported Agriculture (CSA)
  • Conference Management
  • Content Management Systems (CMS)
  • DNS
  • Document Management
  • Document Management - E-books
  • Document Management - Institutional Repository and Digital Library Software
  • Document Management - Integrated Library Systems (ILS)
  • E-commerce
  • Federated Identity & Authentication
  • Feed Readers
  • File Transfer & Synchronization
  • File Transfer - Distributed Filesystems
  • File Transfer - Object Storage & File Servers
  • File Transfer - Peer-to-peer Filesharing
  • File Transfer - Single-click & Drag-n-drop Upload
  • File Transfer - Web-based File Managers
  • Games
  • Gateways and Terminal Sharing
  • Genealogy
  • Groupware
  • Human Resources Management (HRM)
  • Internet of Things (IoT)
  • Knowledge Management Tools
  • Learning and Courses
  • Maps and Global Positioning System (GPS)
  • Media Streaming
  • Media Streaming - Audio Streaming
  • Media Streaming - Multimedia Streaming
  • Media Streaming - Video Streaming
  • Miscellaneous
  • Money, Budgeting & Management
  • Monitoring
  • Note-taking & Editors
  • Office Suites
  • Password Managers
  • Pastebins
  • Personal Dashboards
  • Photo and Video Galleries
  • Polls and Events
  • Proxy
  • Read-it-later Lists
  • Recipe Management
  • Resource Planning
  • Resource Planning - Enterprise Resource Planning
  • Search Engines
  • Self-hosting Solutions
  • Software Development
  • Software Development - API Management
  • Software Development - Bug Trackers
  • Software Development - Continuous Integration & Deployment
  • Software Development - Documentation Generators
  • Software Development - FaaS & Serverless
  • Software Development - IDE & Tools
  • Software Development - Localization
  • Software Development - Project Management
  • Software Development - UX Testing
  • Static Site Generators
  • Status / Uptime pages
  • Task Management & To-do Lists
  • Ticketing
  • Time Trackers
  • URL Shorteners
  • VPN
  • Web Servers
  • Wikis
• List of Licenses
• Anti-features
• External Links
• Contributing
• Authors
• License

Software

Analytics

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Please visit Awesome Analyticsstars3.1k

Related: Personal Dashboards

Archiving and Digital Preservation (DP)

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Related: Content Management Systems (CMS)

• Access to Memory (AtoM) - Web-based, open source application for standards-based archival description and access in a multilingual, multi-repository environment. (Demo, Source Codestars172) AGPL-3.0-only PHP
• ArchiveBox - Self-hosted wayback machine that creates HTML & screenshot archives of sites from your bookmarks, browsing history, RSS feeds, or other sources. (Source Codestars13.4k) MIT Python
• Archivematica - Mature digital preservation system designed to maintain standards-based, long-term access to collections of digital objects. (Demo, Source Codestars314) AGPL-3.0-only Python
• ArchivesSpace - Archives information management application for managing and providing Web access to archives, manuscripts and digital objects. (Demo, Source Codestars259) ECL-2.0 Ruby
• CKAN - CKAN is a tool for making open data websites. (Source Codestars3.4k) AGPL-3.0 Python
• Collective Access - Providence - Highly configurable Web-based framework for management, description, and discovery of digital and physical collections supporting a variety of metadata standards, data types, and media formats. (Source Codestars227) GPL-3.0-only PHP
• Horahorastars625 - Video hosting website and video archival manager for Niconico, Bilibili, and Youtube. MIT Go

Automation

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Related: Internet of Things (IoT)

• Accelerated Textstars584 - Automatically generate multiple natural language descriptions of your data varying in wording and structure. Apache-2.0 Java
• Actionsflowstars2.5k ⚠ - The free Zapier/IFTTT alternative for developers to automate your workflows based on Github actions. MIT Docker/Nodejs
• ActiveWorkflowstars578 - An intelligent process and workflow automation platform based on software agents. MIT Ruby
• Alltube - Web interface for youtube-dlstars110.3k, a program to download videos and audio from more than 100 websites. (Source Codestars2.3k) GPL-3.0 PHP
• AmIUnique - Learn how identifiable you are on the Internet (browser fingerprinting tool). (Source Codestars625) MIT Java
• Baserow - Open source online database tool and Airtable alternative. Create your own database without technical experience. (Source Code) MIT Python/Nodejs
• Beehivestars5.6k - Flexible event and agent system, which allows you to create your own agents that perform automated tasks triggered by events and filters. AGPL-3.0 Go
• betaninstars156 - Music organization man-in-the-middle of your torrent client and music player. Based on beets.io, similar to Sonarr and Radarr. GPL-3.0 Python
• ChiefOnboarding - Employee onboarding platform that allows you to provision user accounts and create sequences with todo items, resources, text/email/Slack messages, and more! Available as a web portal and Slack bot. (Source Codestars252) AGPL-3.0 Python
• CouchPotato - CouchPotato is an automatic Video Library Manager for Movies. Automatic torrent/nzb searching, downloading, and processing at the qualities you want. (Source Codestars3.9k) GPL-3.0 Python
• Eonza - Eonza is used to create scripts and automate tasks on servers or VPS hosting. Manage your servers from any browser on any device. (Demo, Source Codestars35) MIT Go
• Episodesstars184 ⚠ - Self Hosted TV show Episode tracker and recommender built using django, bootstrap4. MIT Python
• Exadel CompreFace - face recognition system that provides REST API for face recognition, face detection, and other face services, and is easily deployed with docker. There are SDKs for Python and JavaScript languages. Can be used without prior machine learning skills. (Source Codestars2k) Apache-2.0 Docker/Java/Nodejs
• feed2toot - Feed2toot parses a RSS feed, extracts the last entries and sends them to Mastodon. (Source Code) GPL-3.0 Python
• feedmixerstars87 - FeedMixer is a WSGI (Python3) micro web service which takes a list of feed URLs and returns a new feed consisting of the most recent n entries from each given feed(Returns Atom, RSS, or JSON). (Demo) WTFPL Python
• Headphonesstars3.1k - Automated music downloader for NZB and Torrent, written in Python. It supports SABnzbd, NZBget, Transmission, µTorrent, Deluge and Blackhole. GPL-3.0 Python
• Healthchecks - Django app which listens for pings and sends alerts when pings are late. (Source Codestars5.1k) BSD-3-Clause Python
• homebank-converterstars35 - Web app to convert an export bank file to compatible Homebank csv. (Demo) AGPL-3.0 HTML5
• HRConvert2stars315 - Drag-and-drop file conversion server with session based authentication, automatic temporary file maintenance, and logging capability. GPL-3.0 PHP
• Huginnstars35.7k - Allows you to build agents that monitor and act on your behalf. MIT Ruby
• Kibitzr - Lightweight personal web assistant with powerful integrations. (Source Codestars471) MIT Python
• Krayin - Free and Opensource Laravel CRM Application. (Source Codestars891) MIT PHP
• LazyLibrarian ⚠ - LazyLibrarian is a program to follow authors and grab metadata for all your digital reading needs. It uses a combination of Goodreads Librarything and optionally GoogleBooks as sources for author info and book info. GPL-3.0 Python
• Leon - Open-source personal assistant who can live on your server. (Source Codestars8.7k) MIT Nodejs
• Lidarr - Lidarr is a music collection manager for Usenet and BitTorrent users. (Source Codestars2.4k) GPL-3.0 C#
• Medusa - Automatic Video Library Manager for TV Shows. It watches for new episodes of your favorite shows, and when they are posted it does its magic. (Source Codestars1.4k) GPL-3.0 Python
• MetaTubestars82 ⚠ - A Web GUI to automatically download music from YouTube add metadata from Spotify, Deezer or Musicbrainz. GPL-3.0 Python
• MeTubestars909 - Web GUI for youtube-dl, with playlist support. Allows downloading videos from dozens of websites. AGPL-3.0 Python/Nodejs/Docker
• nefariousstars594 - Web application that automates downloading Movies and TV Shows. GPL-3.0 Python
• NocoDB - No-code platform that turns any database into a smart spreadsheet. It can be considered as an Airtable or Smartsheet alternative. (Source Codestars27.8k) GPL-3.0 Nodejs
• OliveTinstars573 - OliveTin is a web interface for running Linux shell commands. AGPL-3.0 Go
• Patrowlstars480 - Open Source, Smart and Scalable Security Operations Orchestration Platform. AGPL-3.0 Python
• Podgrabstars697 - Lightweight podcast manager and automatic podcast episode downloader. It will monitor podcasts for your and download them automatically whenever a new episode goes live. GPL-3.0 Docker/Go
• pyLoad - Lightweight, customizable and remotely manageable downloader for 1-click-hosting sites like rapidshare.com or uploaded.to. (Source Codestars2.5k) GPL-3.0 Python
• Radarr - Radarr is an independent fork of Sonarr reworked for automatically downloading movies via Usenet and BitTorrent, à la Couchpotato. (Source Codestars6.3k) GPL-3.0 C#
• SickRage - SickRage is an automatic Video Library Manager for TV Shows. Automatic torrent/nzb searching, downloading, and processing at the qualities you want. (Source Codestars1.5k) GPL-3.0 Python
• SiteInspector - Web-based tool for catching spelling errors, grammatical errors, broken links, and other errors on websites. (Demo, Source Codestars157) AGPL-3.0 Ruby
• Sonarr - Automatic TV Shows downloader and manager for Usenet and BitTorrent. It can grab, sort and rename new episodes and automatically upgrade the quality of files already downloaded when a better quality format becomes available. (Source Codestars7.4k) GPL-3.0 C#
• StackStorm - StackStorm (aka IFTTT for Ops) is event-driven automation for auto-remediation, security responses, troubleshooting, deployments, and more. Includes rules engine, workflow, 160 integration packs with 6000+ actions and ChatOps. (Source Codestars4.8k) Apache-2.0 Python
• WebUI-aria2stars8.8k - Interface to interact with the aria2 downloader. Very simple to use, just download and open index.html in any web browser. (Demo) MIT HTML5
• ydl_api_ngstars11 - Simple youtube-dl REST API to launch downloads on a distant server. GPL-3.0 Python
• YoutubeDL-Materialstars1.3k - Material Design inspired YouTube downloader, based on youtube-dl. Supports playlists, quality select, search, dark mode and much more, all with a clean and modern design. MIT Nodejs
• Zenbotstars8.2k - Zenbot is a lightweight, extendable, artificially intelligent trading bot for Bitcoin, Ether, Litecoin, and more. MIT Nodejs
• µTaskstars656 - µTask is an automation engine that models and executes business processes declared in yaml. BSD-3-Clause Go

Blogging Platforms

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Related: Static Site Generators, Content Management Systems (CMS)

See also: WeblogMatrix

• Antville - Free, open source project aimed at the development of a high performance, feature rich weblog hosting software. (Source Codestars57) Apache-2.0 Javascript
• Blogstars207 - Facebook-styled blog. Free, extremely lightweight, single-user and easy to install. (Demo) GPL-3.0 PHP
• Blogotextstars133 - Free blog-engine written in PHP and using SQLite. This offers you both an unmatched simplicity during installation and great performances. MIT PHP
• Bludit ⚠ - Simple application to build a site or blog in seconds. Bludit uses flat-files (text files in JSON format) to store posts and pages. (Demo, Source Codestars992) MIT PHP
• Cadmusstars17 - Cadmus is an extremely lightweight, flat-file blogging platform powered by Markdown. MIT PHP
• Canvas - A Laravel publishing platform. (Source Codestars3k) MIT PHP
• Castopod - A podcast management hosting platform that includes the latest podcast 2.0 standards, an automated Fediverse feed, analytics, an embeddable player, and more. (Source Code) AGPL-3.0 PHP
• Chyrp Lite - Extra-awesome, extra-lightweight blog engine. (Source Codestars179) BSD-3-Clause PHP
• Dante Stories - Self hosted Medium platform built with Ruby on Rails. (Source Codestars391) MIT Ruby
• Dotclear - Take control over your blog. (Source Code) GPL-2.0 PHP
• Formtools - Powerful, flexible, free and open source PHP/MySQL script to manage your forms and data. (Source Code) GPL-2.0 PHP
• Ghost - Just a blogging platform. (Source Codestars40.3k) MIT Nodejs
• Haven - Private blogging system with markdown editing and built in RSS reader. (Demo, Source Codestars440) MIT Ruby
• Hotglue - Freehand CMS which allows to construct websites directly in a web-browser. It uses flat files for storage and provides an intuitive GUI. (Demo, Source Codestars182) GPL-3.0 PHP
• htmly - Databaseless Blogging Platform (Flat-File Blog). (Demo, Source Codestars804) GPL-2.0 PHP
• Known - A collaborative social publishing platform. (Source Codestars937) Apache-2.0 PHP
• Plume - Federated blogging engine, based on ActivityPub. (Source Codestars1.7k) AGPL-3.0 Rust
• PluXml - XML-based blog/CMS platform. (Source Codestars189) GPL-1.0 PHP
• Serendipity - Serendipity (s9y) is a highly extensible and customizable PHP blog engine using Smarty templating. (Source Codestars169) BSD-3-Clause PHP

Booking and Scheduling

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Related: Polls and Events

• Alf.io - The open source ticket reservation system. (Demo, Source Codestars976) GPL-3.0 Java
• Cal.com - The open-source online appointment scheduling system. (Demo, Source Codestars11.8k) MIT Nodejs
• Easy!Appointments - A highly customizable web application that allows your customers to book appointments with you via the web. (Demo, Source Codestars2.2k) GPL-3.0 PHP

Bookmarks and Link Sharing

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• dyu bookmarksstars139 - Single-threaded/process bookmark app powered by leveldb and uWebSockets. Supports importing from Delicious and Chrome. (Demo) Apache-2.0 Java
• Espialstars495 - An open-source, web-based bookmarking server. AGPL-3.0 Haskell
• Firefox Account Server - This allows you to host your own Firefox accounts server. (Source Codestars423) MPL-2.0 Nodejs, Java
• Firefox Sync Serverstars1.6k - Sync Firefox bookmarks, passwords, history, tabs, preferences. MPL-2.0 Python
• Geekmarks - Personal bookmarking service focused on speed and organization using hierarchical tags. (Source Codestars563) BSD-2-Clause Go
• golinks - Web application that allows you to create smart bookmarks, commands and aliases by pointing your web browser's default search engine at a running instance. Similar to bunny1 or yubnub. (Demo) MIT Go
• Hackersharestars329 - Social bookmarks website for hackers. (Demo) MIT Ruby
• LinkAce - A bookmark archive with automatic backups to the Internet Archive, link monitoring, and a full REST API. Installation is done via Docker, or as a simple PHP application. (Demo, Source Codestars1.4k) GPL-3.0 PHP
• linkdingstars1.7k - Minimal bookmark management with a fast and clean UI. Simple installation through Docker and can run on your Raspberry Pi. (Demo) MIT Docker/Python/Nodejs
• Lobsters - Run your own link aggregation site. (Source Codestars16) BSD-3-Clause Ruby
• No Fuss Bookmarks - Very simple software and service to store bookmarks especially designed for hackers (that don't need fancy interfaces, but nice API). (Source Codestars116) GPL-3.0 Python
• Pinry - The tiling image board system for people who want to save, tag, and share images, videos, and webpages. (Source Codestars2.5k) BSD-2-Clause Python
• Reminiscencestars1.5k - Self-Hosted Bookmark And Archive Manager. AGPL-3.0 Python
• Shaarlistars2.6k - Personal, minimalist, super-fast, no-database bookmarking and link sharing platform. (Demo) Zlib PHP
• Shioristars6k - Simple bookmark manager built with Go. MIT Go
• ubookmark - LDAP enabled bookmarking service. (Demo, Source Code) GPL-2.0 Python
• unmark - Open source to do app for links. (Source Codestars1.5k) MIT PHP
• xBrowserSync - Open source tool for syncing browser data between browsers and devices. (Source Code) MIT Nodejs

Calendar & Contacts

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Related: Groupware

See also: Comparison of CalDAV and CardDAV implementations - Wikipedia

Calendar & Contacts - CalDAV or CardDAV Servers

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• Baïkal - Lightweight CalDAV and CardDAV server based on sabre/dav. (Source Codestars1.9k) GPL-3.0 PHP
• calypso - Python-based CalDAV and CardDAV server, forked from Radicale. (Source Code) GPL-3.0 Python
• DAViCal - Server for calendar sharing (CalDAV) that uses a PostgreSQL database as a data store. (Source Code) GPL-2.0 PHP
• Davisstars117 - A simple, dockerizable and fully translatable admin interface for sabre/dav based on Symfony 5 and Bootstrap 4, largely inspired by Baïkal. MIT PHP
• DecSync CC - Serverless contacts, calendar synchronization using your own file syncing method i.e Syncthing, Nextcloud etc. (Source Codestars165) GPL-3.0 Kotlin
• Etebase (EteSync) - End-to-end encrypted and journaled personal information server supporting calendar and contact data, offering its own clients. (Source Codestars1.1k) AGPL-3.0 Python/Django
• Radicale - Simple calendar and contact server with extremely low administrative overhead. (Source Codestars2.4k) GPL-3.0 Python
• SabreDAV - Open source CardDAV, CalDAV, and WebDAV framework and server. (Source Codestars1.2k) MIT PHP
• Xandikos - Open source CardDAV and CalDAV server with minimal administrative overhead, backed by a Git repository. (Source Codestars220) GPL-3.0 Python

Calendar & Contacts - CalDAV or CardDAV Web-based Clients

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• AgenDAV - Multilanguage CalDAV web client with a rich AJAX interface and shared calendars support. (Source Codestars483) GPL-3.0 PHP
• Bloben - CalDAV web client. (Demo, Source Codestars72) AGPL-3.0 Docker
• EteSync Web - EteSync's official Web-based client (i.e., their Web app). (Demo, Source Codestars211) AGPL-3.0 Javascript
• InfCloud - Open source CalDAV/CardDAV web client implementation. (Demo, Source Code) AGPL-3.0 Javascript

Communication

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Communication - Custom Communication Systems

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• BluetoothCommunicatorExamplestars21 - Bluetooth LE chat app to communicate between android devices with P2P architecture. (Clientsstars64) Apache-2.0 Java
• Centrifugostars6k - Language-agnostic real-time messaging (Websocket or SockJS) server. (Demostars6k) MIT Go
• Chaskiq - Full featured livechat, helpcenter and CRM as an alternative to Intercom & Drift, Crisp and others. (Source Codestars2k) AGPL-3.0 Ruby
• Chatwoot - Self-hosted customer communication platform, an alternative to Intercom & Zendesk. (Source Codestars12.7k) MIT Ruby
• Cherrystars274 - Tiny webchat server. GPL-2.0 Go
• Conduit - A simple, fast, and reliable chat server powered by Matrix. (Source Code) Apache-2.0 Rust
• Darkwire.iostars728 - End-to-end encrypted instant web chat. MIT Nodejs
• Element - Fully-featured Matrix client for Web, iOS & Android. (Source Codestars8.4k) Apache-2.0 Javascript
• Enigma Reloadedstars49 - DIY Message and file encryption for any platform. GPL-3.0 Javascript
• Freenet - Anonymously share files, browse and publish freesites (web sites accessible only through Freenet) and chat on forums. (Source Codestars799) GPL-2.0 Java
• Galene - Galène (or Galene) is a videoconference server (an “SFU”) that is easy to deploy and that requires moderate server resources. (Source Codestars636) MIT Go
• GNUnet - Free software framework for decentralized, peer-to-peer networking. (Source Code) GPL-3.0 C
• Gotify - Self-hosted notification server with Android and CLI clients, similar to PushBullet. (Source Codestars7.4k, Clientsstars499) MIT Go
• Hawkpost - HawkPost is a web app that lets you create unique links that you can share with a person that desires to send you important information but doesn't know how to encrypt it. The message is encrypted in their browser and sent to your email address. (Source Codestars881) MIT Python
• Jam - Jam is an open source alternative to Clubhouse: private audio chat rooms to talk to friends and family. (Demo, Source Codestars1k) AGPL-3.0 Docker/Node.js
• Jami - Free and universal communication platform which preserves the user's privacy and freedoms (formerly GNU Ring). (Source Code) GPL-3.0 C++
• Jitsi Meet - Jitsi Meet is an OpenSource (MIT) WebRTC Javascript application that uses Jitsi Videobridge to provide high quality, scalable video conferences. (Source Codestars18.1k) MIT Javascript
• Jitsi Video Bridge - WebRTC compatible Selective Forwarding Unit (SFU) that allows for multiuser video communication. (Source Codestars2.6k) Apache-2.0 Java
• KChatstars84 - PHP Based Live Chat Application. Apache-2.0 PHP
• LeapChatstars140 - Ephemeral, encrypted, in-browser chat rooms. AGPL-3.0 Javascript
• Lets-Chat - Self hosted chat suite written in Node. (Source Codestars9.6k) MIT Nodejs
• LibreNews - Decentralized and secure breaking news notification system. (Source Codestars80) GPL-3.0 Python
• Live Helper Chat - Live Support chat for your website. (Source Codestars1.6k) Apache-2.0 PHP
• LiveKit - Modern, scalable WebRTC conferencing platform with client SDKs. (Demo, Source Codestars3.3k) Apache-2.0 Go
• Matrix Console Web - Web client meant to be a showcase of Matrix capabilities, and reference implementation of the Matrix standard. (Source Codestars28) Apache-2.0 Javascript
• Mattermost - Open-source, on-prem Slack-alternative. It can be integrated with Gitlab. (Source Codestars23k) AGPL-3.0/Apache-2.0 Go
• MiAOU - Multi-room persistent chat server. (Source Codestars510) MIT Nodejs
• Mibew - Mibew Messenger is an open-source live support application written in PHP and MySQL. It enables one-on-one chat assistance in real-time directly from your website. (Demo, Source Codestars437) Apache-2.0 PHP
• Mumble - Low-latency, high quality voice/text chat software. (Source Codestars4.8k, Clients) BSD-3-Clause C++
• Notifostars216 - Multichannel notification server with support for Email, Mobile Push, Web Push, SMS, messaging and a javascript plugin. (Source Codestars216) MIT C#
• ntfy - Push notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify. (Demo, Source Codestars2.2k, Clientsstars135) Apache-2.0/GPL-2.0 Go
• OTS - One-Time-Secret sharing platform with a symmetric 256bit AES encryption in the browser. (Source Codestars186) Apache-2.0 Go
• Papercups - An open source live customer chat web app written in Elixir. (Demo, Source Codestars4.8k) MIT Elixir
• PushBitsstars149 - Self-hosted notification server for relaying push notifications via Matrix, similar to PushBullet and Gotify. ISC Go
• pWSstars1.9k - pWS is a free, open-source Pusher drop-in alternative. MIT Nodejs
• Rallly - Rallly is an open-source alternative to Doodle that lets you create polls to vote on dates and times. (Source Codestars771) AGPL-3.0 Nodejs
• RetroShare - Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer. (Source Codestars1.5k) GPL-2.0 C++
• Revolt - Revolt is a user-first chat platform built with modern web technologies. (Source Code) AGPL-3.0 Rust
• Rocket.Chat - Teamchat solution similar to Gitter.im or Slack. (Source Codestars32.4k) MIT Nodejs
• Screensystars190 - Simple peer-to-peer screen sharing solution for sharing your screen with WebRTC. (Demo) GPL-3.0 Nodejs
• Shhhstars260 - Keep secrets out of emails or chat logs, share them using secure links with passphrase and expiration dates. MIT Python
• SimpleX Chatstars960 - The most private and secure chat and applications platform - now with double ratchet E2E encryption. AGPL-3.0 Haskell
• Spectrum 2 - Spectrum 2 is an open source instant messaging transport. It allows users to chat together even when they are using different IM networks. (Source Codestars335) GPL-3.0 C++
• Spreed - WebRTC audio/video calls, conferencing server, and web client. (Source Codestars1.1k) AGPL-3.0 Go
• StoneAge Messenger - A self-hosted Android messenger, S3-compatible storage is the only backend needed. (Source Code, Clients) GPL-3.0 Java
• Synapse - Server for Matrix, an open standard for decentralized persistent communication. (Source Codestars9.5k) Apache-2.0 Python
• Syndie - Syndie is a libre system for operating distributed forums. CC0-1.0 Java
• TextBeltstars2.4k ⚠ - Outgoing SMS API that uses carrier-specific gateways to deliver your text messages for free, and without ads. MIT Javascript
• Tinode - Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots. (Demo, Source Codestars8.8k, Clientsstars207) GPL-3.0 Go
• Tox - Distributed, secure messenger with audio and video chat capabilities. (Source Codestars1.7k) GPL-3.0 C
• Tuber - Peer-to-peer video chat that works. (Source Codestars351) MIT Javascript
• Typebot - Typebot is a conversational app builder as an alternative to Typeform or Landbot. (Source Codestars1.1k) AGPL-3.0 Docker
• WBOstars1.3k - A web Whiteboard to collaborate in real-time on schemas, drawings, and notes. (Demo) AGPL-3.0 Nodejs/Docker
• Wirowstars72 - A full featured self-hosted video web-conferencing platform. AGPL-3.0 C
• ZeroNet ⚠ - Open, free, and uncensorable websites, using Bitcoin cryptography and BitTorrent network. (Source Codestars17.5k) GPL-2.0 Python
• Zulip - Zulip is a powerful, open source group chat application. (Source Codestars15.8k) Apache-2.0/Other Python

Communication - Email

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Communication - Email - Complete Solutions

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Simple deployment of a mail server, e.g. for inexperienced or impatient admins.

• AnonAddy - Open source email forwarding service for creating aliases. (Source Codestars1.7k) MIT PHP
• DebOps - Your Debian-based data center in a box. A set of general-purpose Ansible roles that can be used to manage Debian or Ubuntu hosts. (Source Codestars926) GPL-3.0-only YAML/Ansible/Python
• docker-mailserver - Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container. Only configuration files, no SQL database. (Source Codestars9.1k) MIT Docker
• emailwizstars956 - Luke Smith's bash script to completely automate the setup of a Postfix/Dovecot/SpamAssassin/OpenDKIM server on debian. GPL-3.0 Bash
• Excision Mailstars124 - Fullstack, security focused mailserver based on OpenSMTPD for OpenBSD using ansible. ISC Shell/Ansible
• homeboxstars319 - Suite of Ansible scripts to deploy a fully functional mail server on Debian. Unobtrusive and automatic as much as possible, focusing on stability and security. GPL-3.0 Shell
• Inboxen - Inboxen is a service that provides you with an infinite number of unique inboxes. (Source Codestars241) GPL-3.0 Python
• iRedMail - Full-featured mail server solution based on Postfix and Dovecot. (Source Codestars766) GPL-3.0 Shell
• Maddy Mail Serverstars3.1k - All-in-one mail server that implements SMTP (both MTA and MX) and IMAP. Replaces Postfix, Dovecot, OpenDKIM, OpenSPF, OpenDMARC with single daemon. GPL-3.0 Go
• Mail-in-a-Box - Turns any Ubuntu server into a fully functional mail server with one command. (Source Codestars11.1k) CC0-1.0 Shell
• Mailcow - Mail server suite based on Dovecot, Postfix and other open source software, that provides a modern Web UI for administration. (Source Codestars5.2k) GPL-2.0 Docker/PHP
• Mailu - Mailu is a simple yet full-featured mail server as a set of Docker images. (Source Codestars3.7k) MIT Docker/Python
• Modoboa - Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface. (Source Codestars2.1k) ISC Python
• Ptorxstars272 - Email privacy. Anonymously send and receive with alias forwarding. GPL-3.0 Nodejs
• Simple NixOS Mailserver - Complete mailserver solution leveraging the Nix Ecosystem. GPL-3.0 Nix
• SimpleLogin - Open source email alias solution to protect your email address. Comes with browser extensions and mobile apps. (Source Codestars2.5k) MIT Docker/Python
• wildduck - Scalable no-SPOF IMAP/POP3 mail server. (Source Codestars1.5k) EUPL-1.2 Nodejs

Communication - Email - Mail Delivery Agents

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MDAs - IMAP/POP3 software

• Cyrus IMAP - Email (IMAP/POP3), contacts and calendar server. (Source Codestars411) BSD-3-Clause-Attribution C
• Dovecot - IMAP and POP3 server written primarily with security in mind. (Source Codestars673) MIT/LGPL-2.1 C
• MailFormstars27 - Lightweight self-hosted open source alternative to Formspree and SendGrid. Apache-2.0 Nodejs
• Piler - feature-rich open source email archiving solution. (Source Code) GPL-3.0 C

Communication - Email - Mail Transfer Agents

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MTAs / SMTP servers

• chasquid - SMTP (email) server with a focus on simplicity, security, and ease of operation. (Source Code) Apache-2.0 Go
• Courier MTA - Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services. (Source Code) GPL-3.0 C
• Exim - Message transfer agent (MTA) developed at the University of Cambridge. (Source Code) GPL-3.0 C
• Haraka - High-performance, pluginable SMTP server written in Javascript. (Source Codestars4.2k) MIT Javascript
• MailCatcher - Ruby gem that deploys a simply SMTP MTA gateway that accepts all mail and displays in web interface. Useful for debugging or development. (Source Codestars5.6k) MIT Ruby
• Maildrop - Disposable email SMTP server, also useful for development. MIT Scala
• MailHogstars10.2k - Small Golang executable which runs an SMTP MTA gateway that accepts all mail and displays in web interface. Useful for debugging or development. MIT Go
• OpenSMTPD - Secure SMTP server implementation from the OpenBSD project. (Source Code) ISC C
• Postfix - Fast, easy to administer, and secure Sendmail replacement. IPL-1.0 C
• Qmail - Secure Sendmail replacement. (Source Code) CC0-1.0 C
• Sendmail - Message transfer agent (MTA). Sendmail C
• Slimta - Mail Transfer Library built on Python. (Source Codestars157) MIT Python

Communication - Email - Mailing Lists and Newsletters

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Mailing lists servers and mass mailing software - one message to many recipients.

• Dada Mail - Web-based list management system that can be used for announcement lists and/or discussion lists. (Source Codestars135) GPL-2.0 Perl
• Gray Duck Mail - Self hosted email discussion list management that uses external email providers. (Source Codestars1) GPL-3.0 Docker
• HyperKitty - Open source Django application to provide a web interface to access GNU Mailman v3 archives. (Demo, Source Code) GPL-3.0 Python
• Keila - Self-hosted reliable and easy-to-use newsletter tool. Alternative to proprietary services like Mailchimp or Sendinblue. (Demo, Source Codestars549) AGPL-3.0 Elixir
• Listmonk - High performance, self-hosted newsletter and mailing list manager with a modern dashboard. (Source Codestars8.1k) AGPL-3.0 Go
• Mailman - The Gnu mailing list server. GPL-3.0 Python
• Mailtrain - Self hosted newsletter application. (Source Codestars5k) GPL-3.0 Nodejs
• MailyHerald - Self-hosted Mailchimp alternative that you can easily integrate with your site. Helps you send and manage your application mailings. It supports email marketing and conducting the daily stream of notifications you send to your users. (Source Codestars575) LGPL-3.0 Ruby
• Mautic - Mautic is marketing automation software (email, social and more). (Source Codestars5.2k) GPL-3.0 PHP
• phpList - Newsletter and email marketing with advanced management of subscribers, bounces, and plugins. (Source Code) AGPL-3.0 PHP
• Postal - Fully featured open source mail delivery platform for incoming and outgoing e-mail. (Source Codestars11.7k) MIT Ruby
• Postorius - Web user interface to access GNU Mailman. (Source Code) GPL-3.0 Python
• Schleuder - GPG-enabled mailing list manager with resending-capabilities. (Source Code) GPL-3.0 Ruby
• Sympa - Mailing list manager. GPL-2.0 Perl

Communication - Email - Webmail Clients

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• Afterlogic WebMail Lite - Fast and easy-to-use webmail front-end for your existing IMAP mail server, Plesk or cPanel. (Demo, Source Codestars422) AGPL-3.0 PHP
• Cypht - Feed reader for your email accounts. (Source Codestars723) LGPL-2.1 PHP
• IMP - HORDE application that provides webmail access to IMAP and POP3 accounts. (Demo, Source Code) GPL-2.0 PHP
• Isotope Mail - Microservice based webmail client built with ReactJS and Spring. (Source Codestars187) Apache-2.0 Docker/Java
• MailCare - Open source disposable email address service. (Source Codestars211) MIT PHP
• Mailpile - Webmail client with search, filtering, encryption features and more. (Source Codestars8.6k) AGPL-3.0 Python
• Roundcube - Browser-based IMAP client with an application-like user interface. (Source Codestars4.4k) GPL-3.0 PHP
• SnappyMail - Simple, modern, lightweight & fast web-based email client. (It is an actively developed fork of RainLoop). (Demo, Source Codestars257) AGPL-3.0 PHP
• SquirrelMail - Another browser-based IMAP client. (Source Code) GPL-2.0 PHP

Communication - IRC

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IRC communication software

• Convos - Always online web IRC client. (Demo, Source Codestars888) Artistic-2.0 Perl
• Dispatchstars636 - Self-hosted web IRC client written in Go. (Demo) MIT Go
• Ergo - Modern IRCv3 server written in Go, combining the features of an ircd, a services framework, and a bouncer. (Source Codestars1.5k) MIT Go
• Glowing Bearstars885 - A web frontend for WeeChat. (Demo) GPL-3.0 Javascript
• InspIRCd - Modular IRC server written in C++ for Linux, BSD, Windows, and macOS. (Source Codestars968) GPL-2.0-only C++
• Kiwi IRC - Responsive web IRC client with theming support. (Demo, Source Codestars659) Apache-2.0 Nodejs
• ngircd - Free, portable and lightweight Internet Relay Chat server for small or private networks. (Source Codestars330) GPL-2.0 C
• Quassel IRC - distributed IRC client, meaning that one (or multiple) client(s) can attach to and detach from a central core. (Source Codestars653) GPL-2.0 C++
• Robust IRC - RobustIRC is IRC without netsplits. Distributed IRC server, based on RobustSession protocol. (Source Codestars157) BSD-3-Clause Go
• The Lounge - Self-hosted web IRC client. (Demo, Source Codestars4.8k) MIT Nodejs
• Tiny Tiny IRC - An open source AJAX-powered chat platform with support for IRC (Source Code). GPL-3.0 PHP/Java
• UnrealIRCd - Modular, advanced and highly configurable IRC server written in C for Linux, BSD, Windows, and macOS. (Source Codestars332) GPL-2.0 C
• Weechat - Fast, light and extensible chat client. GPL-3.0 C
• ZNC - Advanced IRC bouncer. (Source Codestars1.9k) Apache-2.0 C++