Tutorials

• 2D Splatter Effects Using the Stencil Buffer - Using the stencil buffer in Unity to draw splatter effects on surfaces. This could be used for paint or blood splatter.

• Fixing Gaps Between Sprites - A short tutorial about removing the small gaps that sometimes appear between adjacent sprites.

2D

• 2D Rope System (Paid) - Scripts for creating any type of 2D ropes in the editor or during runtime.

• Ferr2D Terrain Tool (Paid) - Quickly create handcrafted 2D landscapes and levels.

• Unity Anima2D - Advanced skeletal animation editor with support for both per-object and skinned mesh animation with an integrated in-editor skinning tool.

Augmented & Virtual Reality

• SteamVR Unity Toolkit - Scripts and Great examples to abstract the use of VR controller actions in Unity.

Camera

• UFPS (Paid) - Provides camera, controllers, and other effects for use in FPS games.

Monetization

• Unity Monetization - Unity Ads is a video ad network with quick and seamless integration using regular and opt-in ads.

Networking

• Nakama - Build social and realtime games with an open-source distributed server (⭐9.3k).

• Photon Bolt (Paid) - Build networked games without having to know the details of networking or write any complex networking code.

• Photon Unity Networking - Plug and play cloud networking that also works for local hosting. Free for up to 20 concurrent users.

Scripting

• Easy Save 2 (Paid) - A fast and simple way to save and load data on all major platforms supported by Unity.

• UniStorm (Paid) - A customizable dynamic day and night weather system that creates realistic storms and weather.

Services

• Unity Analytics - Provides a dashboard with metrics to help track active players, sessions, retention, and revenue.

Tweening

• DOTween - Tween any numeric property or field (including Vectors, Rectangles, etc.), plus some non-numeric ones (like strings). This is the follow-up to HOTween.

• iTween - A simple, and easy to use animation system.

• LeanTween - FOSS, and also the most lightweight tweening library for Unity. Allows you to tween any value you have access to via the .value() method.

UI

• NGUI (Paid) - A powerful UI system and event notification framework.

• TextMesh Pro - A alternative to render text in uGUI by using the distance field technique, which allows crisp fonts at any scale. This was recently purchased by Unity and will be integrated into the engine in the future.

Utilities

• Grouping Tool - Easily group objects together

• SnazzyGrid (Paid) - Makes it easy to manage positions of assets in the scene with easy to use snapping tools and many more features to improve the scene creation workflow.

• UniMerge (Paid) - Editor extension for merging scenes and prefabs, also integrates with VCS.

Visual Scripting

• Playmaker (Paid) - Quickly make gameplay prototypes, A.I. behaviors, animation graphs, interactive objects, and more using finite state machines.

AI

• Apex Path (Paid) - Apex Path handles dynamic pathfinding including local avoidance steering and dynamic obstacles.

Frameworks

• uFrame (Paid) - Create maintainable games faster, better, more stable, and consistent than ever before.

Tips and Tricks

• Unity Labs' Super Science (⭐722) - Gems of Unity Labs for user education.

Video

• Vimeo Unity SDK (⭐212) - Easily stream your Vimeo videos into Unity or record and publish out to Vimeo.

Tweening

• GoKit (⭐586) - An open source, lightweight tween library aimed at making tweening objects dead simple.

Augmented & Virtual Reality

• Virtual Reality Toolkit (⭐3.7k) - Virtual Reality framework that allows for powerful interactions, locomotion, and visual effects.

AI

• Crystal AI (⭐466) - Crystal is a fast, scalable and extensible utility based AI framework for C# and Unity.

Utilities

• Scene View Bookmarks (⭐102) - Editor extension to bookmark and later recall scene views.

Games

• Nodulus (⭐549) - A complete puzzle game with a clever twist. Play it online.

Utilities

• GitHub for Unity - The new GitHub for Unity extension brings the GitHub workflow and more to Unity, providing support for large files with Git LFS and file locking.

2D

• Tiled2Unity - Takes your Tiled files and creates Unity prefabs from them that are easily placed into your Unity scene. Complex collision is supported through Unity’s PolygonCollider2D class.

Modeling

• SabreCSG - A set of CSG level design tools for building complex levels quickly inside Unity.

Frameworks

• Fungus (⭐1.7k) - An easy to use Unity 3D library for creating illustrated Interactive Fiction games.

Augmented & Virtual Reality

• ARToolKit - Augmented Reality SDK that includes libraries, utilities, and examples.

• Vuforia - Augmented Reality SDK with image and object recognition, smart terrain and extended tracking features.

Character Controllers

• CharacterController2D (⭐1.1k) - A 2D controller that behaves very similarly to Unity's CharacterController component.

Utilities

• Consolation (⭐870) - In-game debug console that displays output from Debug.Log.

Frameworks

• StrangeIoC - Strange is a super-lightweight and highly extensible Inversion-of-Control (IoC) framework, written specifically for C# and Unity.

2D

• UnityTiled - An importer for Tiled maps.

Tutorials

• Unity in HoloLens - Official tutorials from Microsoft for creating Microsoft HoloLens applications.

Augmented & Virtual Reality

• Google VR SDK - Scripts and prefabs to help with the development of Google Daydream and Cardboard apps for Android and iOS.

Input

• TouchScript (⭐1.7k) - Makes handling complex gesture interactions on any touch surface much easier.

Tutorials

• Unity Virtual Reality - Unity's official documentation on developing virtual reality applications.

Tips and Tricks

• Unity Tips - Short videos showing some handy tips when using Unity.

Tutorials

• Ray Wenderlich's Tutorials - Beginner and mid-level tutorials focused on learning Unity features or creating small example games.

2D

• Pixel Camera 2D (⭐503) - A simple pixel perfect camera with scaling options for 2D Games.

Tutorials

• A Gentle Introduction to Shaders in Unity3D - This series of posts will introduce you to shader coding, and is oriented to developers with little to no knowledge about shaders.

Utilities

• UniRx (⭐7.1k) - UniRx (Reactive Extensions for Unity) is a reimplementation of the .NET Reactive Extensions. Rx cures the "asynchronous blues" without async/await.

2D

• Spine (Paid) - A skeletal animation editor with a Unity library.

AI

• A* Pathfinding Project - Lightning fast pathfinding with heavily optimized algorithms and a large feature set.

Input

• InControl (⭐694) - An input manager that tames makes handler cross-platform. controller input easy.

• InputBinder (⭐76) - Bind game inputs to methods via code or using the inspector to add event driven input handling to your project.

• TouchKit (⭐907) - Makes it easy to recognize gestures and other touch input.

Utilities

• UnityToolbag - Collection of miscellaneous open source scripts and helpers for Unity 5.0.

Tutorials

• Amit’s Game Programming Information - An great collection of general purpose game programming content.

Tutorials

• Game Programming Patterns - Lots of great game development patterns useful when making games with or without Unity.

Tutorials

• Modern GUI Development in Unity 4.6 - A video tutorial providing an in-depth explanation of Unity's new UI system.

Tips and Tricks

• Editor Tips - Tips in gif form showing a few ways to use the editor more efficiently.

Tutorials

• Catlike Coding - Tutorials designed for learning the C# scripting side of Unity.

• Official Video Tutorials - The official tutorials for scripting, animation, audio, and almost anything Unity related.