simple-captcha-solver by ptigas
simple CAPTCHA solver in python 
created at Feb. 18, 2011, 12:09 a.m.
captcha_recognize by PatrickLib
Image Recognition captcha without image segmentation 无需图片分割的验证码识别
created at May 19, 2017, 1:07 a.m.
CaptchaImageView by jineshfrancs
Custom ImageView to generate captcha image.
created at Nov. 25, 2016, 6:27 a.m.
SwipeCaptcha by mcxtzhang
Swipe captcha of Android platform. Android 平台的滑动验证码。
created at Nov. 14, 2016, 9:34 a.m.
captcha-break by nladuo
captcha break based on opencv2, tesseract-ocr and some machine learning algorithm.
created at May 21, 2016, 4:49 p.m.
negative-captcha by subwindow
A plugin to make the process of creating a negative captcha in Rails much less painful
created at June 1, 2008, 4:59 p.m.
simple-railway-captcha-solver by JasonLiTW
實作基於CNN的台鐵訂票驗證碼辨識以及透過模仿及資料增強的訓練集產生器 (Simple captcha solver based on CNN and a training set generator by imitating the style of captcha and data augmentation)
created at Dec. 24, 2017, 1:24 p.m.
MotionCAPTCHA by wjcrowcroft
MotionCAPTCHA jQuery Plugin - Stop Spam, Draw Shapes
created at May 27, 2011, 2:03 p.m.
captcha-tensorflow by JackonYang
Image Captcha Solving Using TensorFlow and CNN Model. Accuracy 90%+
created at Feb. 5, 2017, 7:55 a.m.
django-simple-captcha by mbi
Django Simple Captcha is an extremely simple, yet highly customizable Django application to add captcha images to any Django form.
created at April 4, 2012, 2:35 p.m.