一套用于生成各种图形验证码的库(Java)，-A minimalist CAPTCHA generation framework for Java/J2EE, with example implementations provided for J2EE (see sc.war) and Grails.

Delphi 图形验证码识别引擎,编程学习源码，很好的参考资料。-Delphi captcha recognition engine, learning programming source code, a good reference.