guojikai/captcha-image-creator
一个PHP写的中文验证码图片生成工具，仅生成验证码图片不进行缓存，需封装使用。
时间：2016-01-19 03:11
krowinski/one-click-captcha
Simple captcha that requires from user to only click a cut circle on image with several other circles. You can customize color of circles, background, width and height of image. Its very lightweight require no js just simple form in html and php gd extension.
时间：2015-12-07 01:20
infinity-next/brennan-captcha
An anti-bot image captcha system written by Frederick Brennan and ported to Laravel for Infinity Next by Joshua Moon.
时间：2015-09-07 11:26
diszo2009/multi-captcha
Multiple(7) types of CAPTCHA in one package. Supports Gif captcha( Animated Gif captcha), Image Captcha( User has to type SOME OR ALL part of code displayed in the image), HoneyPot captcha(It simply adds an empty field asking users to leave it blank. Bots fill it up.), ASCII captcha(It displays the
时间：2015-08-03 09:47
sameer-shelavale/multi-captcha
Multiple(7) types of CAPTCHA in one package. Supports Gif captcha( Animated Gif captcha), Image Captcha( User has to type SOME OR ALL part of code displayed in the image), HoneyPot captcha(It simply adds an empty field asking users to leave it blank. Bots fill it up.), ASCII captcha(It displays the
时间：2015-06-18 14:09
npetrovski/php5-image
Object-oriented image handling and manipulation library
时间：2015-04-16 11:34
elcodedocle/captchalot
Captcha image generator/validator RESTful web service
时间：2014-10-26 22:34
stil/cool-captcha
Classes generating fancy image captchas using GD extension.
时间：2014-02-14 00:27
phpcfdi/image-captcha-resolver
Conectores para resolver captchas de imágenes
时间：未知