Libraries

• patchca - Simple yet powerful CAPTCHA library written in Java.

Generation

• captcha-api - Free, fast and reliable Captcha API POWERED BY AI

Generation

• koto-bank/kocaptcha (⭐56) - A simple captcha service with a single API endpoint, written in Rust.

• Captcheck - Lightweight, self-hostable CAPTCHA service written in PHP 7 and MySQL. Uses a selection of icons from Font-Awesome. Text-only accessibility mode and support for keyboard-only operation.

• Securimage - Open-source free PHP Captcha script.

• Lokno/click-captcha (⭐1) - A visual, click-based CAPTCHA for human authentication.

• ArgoZhang/SliderCaptcha (⭐306) - Slider captcha supporting mobile.

Other / Chinese

• Hashcash for PHP/JavaScript forms (⭐57) - An alternative to captcha to fight spam, based on proof-of-work.

Crack / General

• kerlomz/captcha_trainer (⭐3.2k) - Based on CNN5/DenseNet+BLSTM/LSTM+CTC to realize verification code identification. Only for training the model.

Libraries

• lorien/captcha_solver (⭐258) - Universal python API to different captcha solving services.

Crack / General

• dessant/buster (⭐9.3k) - Captcha solver extension for humans and monsters.

Crack / General

• arunpatala/captcha (⭐179) - Breaking captchas using torch.

• zakizhou/CAPTCHA (⭐69) - Implement classification for CAPTCHA in TensorFlow.

• nladuo/captcha-break (⭐727) - Captcha break based on opencv2, tesseract-ocr and some machine learning algorithm.

• ypwhs/captcha_break (⭐2.8k) - Captcha break using CNN with Keras.

• ptigas/simple-captcha-solver (⭐600) - Simple CAPTCHA solver in python 🐍.

• rickyhan/SimGAN-Captcha (⭐438) - Solve captcha without manually labeling a training set.

• arunpatala/captcha.irctc (⭐215) - Reading irctc captchas with 98% accuracy using deep learning.

• JackonYang/captcha-tensorflow - Image Captcha Solving Using TensorFlow and CNN Model.

• skyduy/CNN_keras (⭐291) - CNN | Keras | CAPTCHA recognition（卷积神经网络、Keras框架、验证码识别）.

• PatrickLib/captcha_recognize (⭐571) - Image Recognition captcha without image segmentation.

• zhengwh/captcha-svm (⭐209) - Use svm to hack simple captcha.

• chxj1992/captcha_cracker (⭐199) - Crack captcha with CNN.

• chxj1992/slide_captcha_cracker (⭐141) - Crack solution for slide captcha with Canny algorithm.

• JasonLiTW/simple-railway-captcha-solver#english-version (⭐816) - Simple captcha solver based on CNN and a training set generator by imitating the style of captcha.

• lllcho/CAPTCHA-breaking (⭐221) - Breaking the captcha.

Crack / Chinese

• burness/chinese_hand_write_rec (⭐1.1k) - Handwritten chinese recognition.

• taosir/cnn_handwritten_chinese_recognition (⭐555) - As the name shows, handwritten_chinese_recognition with cnn.

• soloice/Chinese-Character-Recognition (⭐205) - This project shows how to use CNN to perform Chinese character recognition, a much more complicated task compared to MNIST digit recognition.

• muchrooms/zheye (⭐792) - Chinese captcha recognition program for handstand character of zhihu.

• aaronshan/12306-captcha (⭐286) - Recognize 12306 captcha with deep learning.

Generation

• dchest/captcha (⭐2.1k) - Go package captcha implements generation and verification of image and audio CAPTCHAs.

• lepture/captcha (⭐1.1k) - A captcha library that generates audio and image CAPTCHAs.

• lemonce/svg-captcha (⭐1.9k) - Generate svg captcha in Node.js.

• DoubleSpout/ccap (⭐477) - Node.js generate captcha using c++ library CImg without install any other lib or software.

• contra/captchagen (⭐183) - Captcha generation for Node.js.

• jineshfrancs/CaptchaImageView (⭐611) - Custom ImageView to generate captcha image.

• mcxtzhang/SwipeCaptcha (⭐707) - Swipe captcha of Android platform.

• mojocn/base64Captcha (⭐2.4k) - Golang base64-captcha supports digits, numbers,alphabet, arithmetic, audio and digit-alphabet captcha.

Crack / Chinese

• nickliqian/cnn_captcha (⭐2.9k) - Use cnn recognize captcha by tensorflow.

Libraries

• mewebstudio/captcha (⭐2.6k) - Captcha for Laravel 5.

• CGregwar/Captcha (⭐1.8k) - PHP Captcha library.

• trekjs/captcha (⭐466) - A Lightweight Pure JavaScript Captcha for Node.js. No C/C++, No ImageMagick, No Canvas.

• google/recaptcha (⭐3.6k) - PHP client library for reCAPTCHA, a free service to protect your website from spam and abuse.

• ambethia/recaptcha (⭐2k) - ReCaptcha helpers for ruby apps.

• anhskohbo/no-captcha (⭐1.8k) - No CAPTCHA reCAPTCHA For Laravel.

Crack / General

• ecthros/uncaptcha (⭐2.8k) - Defeating Google's audio reCaptcha with 85% accuracy.

Tools / Chinese

• Tesseract (⭐76k) - Tesseract Open Source OCR Engine.

• Negative-captcha (⭐786) - A plugin to make the process of creating a negative captcha in Rails much less painful.

• Django-simple-captcha (⭐1.4k) - An extremely simple, yet highly customizable Django application to add captcha images to any Django form.

• Securimage (⭐575) - PHP CAPTCHA Script.

• Captcha_solver (⭐258) - Univeral API to captcha solving services.

Other / Chinese

• VisualCaptcha - A collection of all the different versions/repos of visualCaptcha.

Maintainers / Chinese

• @ZYSzys

Tools / Chinese

• MotionCAPTCHA (⭐822) - MotionCAPTCHA jQuery Plugin - Stop Spam, Draw Shapes.