CAPTCHA

is a type of challenge–response test used in computing to determine whether or not the user is human.

mewebstudio/captcha

Captcha for Laravel 5.

CGregwar/Captcha

PHP Captcha library.

trekjs/captcha

A Lightweight Pure JavaScript Captcha for Node.js. No C/C++, No ImageMagick, No Canvas.

patchca

Simple yet powerful CAPTCHA library written in Java.

google/recaptcha

PHP client library for reCAPTCHA, a free service to protect your website from spam and abuse.

ambethia/recaptcha

ReCaptcha helpers for ruby apps.

anhskohbo/no-captcha

No CAPTCHA reCAPTCHA For Laravel.

lorien/captcha_solver

Universal python API to different captcha solving services.

WebDecoy/FCaptcha

Self-hosted, invisible CAPTCHA that detects bots and AI agents via behavioral analysis, TLS fingerprinting, and SHA-256 proof of work. Checkbox or invisible mode; Go, Python, and Node.js servers.

captcha-api

Free, fast and reliable Captcha API POWERED BY AI

dchest/captcha

Go package captcha implements generation and verification of image and audio CAPTCHAs.

lepture/captcha

A captcha library that generates audio and image CAPTCHAs.

lemonce/svg-captcha

Generate svg captcha in Node.js.

DoubleSpout/ccap

Node.js generate captcha using c++ library CImg without install any other lib or software.

contra/captchagen

Captcha generation for Node.js.

jineshfrancs/CaptchaImageView

Custom ImageView to generate captcha image.

mcxtzhang/SwipeCaptcha

Swipe captcha of Android platform.

mojocn/base64Captcha

Golang base64-captcha supports digits, numbers,alphabet, arithmetic, audio and digit-alphabet captcha.

koto-bank/kocaptcha

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

A visual, click-based CAPTCHA for human authentication.

ArgoZhang/SliderCaptcha

Slider captcha supporting mobile.

PrivateCaptcha

Proof-of-Work captcha, written in Go.

arunpatala/captcha

Breaking captchas using torch.

zakizhou/CAPTCHA

Implement classification for CAPTCHA in TensorFlow.

nladuo/captcha-break

Captcha break based on opencv2, tesseract-ocr and some machine learning algorithm.

ypwhs/captcha_break

Captcha break using CNN with Keras.

ptigas/simple-captcha-solver

Simple CAPTCHA solver in python 🐍.

rickyhan/SimGAN-Captcha

Solve captcha without manually labeling a training set.

arunpatala/captcha.irctc

Reading irctc captchas with 98% accuracy using deep learning.

JackonYang/captcha-tensorflow

Image Captcha Solving Using TensorFlow and CNN Model.

skyduy/CNN_keras

CNN | Keras | CAPTCHA recognition（卷积神经网络、Keras框架、验证码识别）.

PatrickLib/captcha_recognize

Image Recognition captcha without image segmentation.

zhengwh/captcha-svm

Use svm to hack simple captcha.

chxj1992/captcha_cracker

Crack captcha with CNN.

chxj1992/slide_captcha_cracker

Crack solution for slide captcha with Canny algorithm.

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

Breaking the captcha.

ecthros/uncaptcha

Defeating Google's audio reCaptcha with 85% accuracy.

dessant/buster

Captcha solver extension for humans and monsters.

kerlomz/captcha_trainer

Based on CNN5/DenseNet+BLSTM/LSTM+CTC to realize verification code identification. Only for training the model.

burness/chinese_hand_write_rec

Handwritten chinese recognition.

taosir/cnn_handwritten_chinese_recognition

As the name shows, handwritten_chinese_recognition with cnn.

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

Chinese captcha recognition program for handstand character of zhihu.

aaronshan/12306-captcha

Recognize 12306 captcha with deep learning.

nickliqian/cnn_captcha

Use cnn recognize captcha by tensorflow.

Tesseract

Tesseract Open Source OCR Engine.

MotionCAPTCHA

MotionCAPTCHA jQuery Plugin - Stop Spam, Draw Shapes.

Negative-captcha

A plugin to make the process of creating a negative captcha in Rails much less painful.

Django-simple-captcha

An extremely simple, yet highly customizable Django application to add captcha images to any Django form.

Securimage

PHP CAPTCHA Script.

lorien/captcha_solver

Universal python API to different captcha solving services.

VisualCaptcha

A collection of all the different versions/repos of visualCaptcha.

Hashcash for PHP/JavaScript forms

An alternative to captcha to fight spam, based on proof-of-work.

@ZYSzys