- [trekjs/captcha](https://github.com/trekjs/captcha) - A Lightweight Pure JavaScript Captcha for Node.js. No C/C++, No ImageMagick, No Canvas.
- [pusuo/patchca](https://github.com/pusuo/patchca) - Simple yet powerful CAPTCHA library written in Java.
- [google/recaptcha](https://github.com/google/recaptcha) - PHP client library for reCAPTCHA, a free service to protect your website from spam and abuse.
- [ambethia/recaptcha](https://github.com/ambethia/recaptcha) - ReCaptcha helpers for ruby apps.
- [anhskohbo/no-captcha](https://github.com/anhskohbo/no-captcha) - No CAPTCHA reCAPTCHA For Laravel.
- [arunpatala/captcha](https://github.com/arunpatala/captcha) - Breaking captchas using torch.
- [zakizhou/CAPTCHA](https://github.com/zakizhou/CAPTCHA) - Implement classification for CAPTCHA in TensorFlow.
- [nladuo/captcha-break](https://github.com/nladuo/captcha-break) - Captcha break based on opencv2, tesseract-ocr and some machine learning algorithm.
- [ypwhs/captcha_break](https://github.com/ypwhs/captcha_break) - Captcha break using CNN with Keras.
- [ptigas/simple-captcha-solver](https://github.com/ptigas/simple-captcha-solver) - Simple CAPTCHA solver in python 🐍.
- [rickyhan/SimGAN-Captcha](https://github.com/rickyhan/SimGAN-Captcha) - Solve captcha without manually labeling a training set.
- [arunpatala/captcha.irctc](https://github.com/arunpatala/captcha.irctc) - Reading irctc captchas with 98% accuracy using deep learning.
- [JackonYang/captcha-tensorflow](https://github.com/JackonYang/captcha-tensorflow) - Image Captcha Solving Using TensorFlow and CNN Model.
- [skyduy/CNN_keras](https://github.com/skyduy/CNN_keras) - CNN | Keras | CAPTCHA recognition(卷积神经网络、Keras框架、验证码识别).
- [PatrickLib/captcha_recognize](https://github.com/PatrickLib/captcha_recognize) - Image Recognition captcha without image segmentation.
- [zhengwh/captcha-svm](https://github.com/zhengwh/captcha-svm) - Use svm to hack simple captcha.
- [chxj1992/captcha_cracker](https://github.com/chxj1992/captcha_cracker) - Crack captcha with CNN.
- [chxj1992/slide_captcha_cracker](https://github.com/chxj1992/slide_captcha_cracker) - Crack solution for slide captcha with Canny algorithm.
- [JasonLiTW/simple-railway-captcha-solver#english-version](https://github.com/JasonLiTW/simple-railway-captcha-solver#english-version) - Simple captcha solver based on CNN and a training set generator by imitating the style of captcha.
- [lllcho/CAPTCHA-breaking](https://github.com/lllcho/CAPTCHA-breaking) - Breaking the captcha.
- [burness/chinese_hand_write_rec](https://github.com/burness/tensorflow-101/tree/master/chinese_hand_write_rec/src) - Handwritten chinese recognition.
- [taosir/cnn_handwritten_chinese_recognition](https://github.com/taosir/cnn_handwritten_chinese_recognition) - As the name shows, handwritten_chinese_recognition with cnn.
- [soloice/Chinese-Character-Recognition](https://github.com/soloice/Chinese-Character-Recognition) - This project shows how to use CNN to perform Chinese character recognition, a much more complicated task compared to MNIST digit recognition.
- [muchrooms/zheye](https://github.com/muchrooms/zheye) - Chinese captcha recognition program for handstand character of zhihu.
- [aaronshan/12306-captcha](https://github.com/aaronshan/12306-captcha) - Recognize 12306 captcha with deep learning.
- [Negative-captcha](https://github.com/subwindow/negative-captcha) - A plugin to make the process of creating a negative captcha in Rails much less painful.
- [Django-simple-captcha](https://github.com/mbi/django-simple-captcha) - An extremely simple, yet highly customizable Django application to add captcha images to any Django form.