Era Captcha is really simple and colorful captcha class. Some key features are: - Three-way verification [Session, Cookie, Session + Cookie both] - Three diffrent captcha style [Mathematics, random words and numbers, dictionary] - 3 line code block - Very easy to configure - Support multiple instances - Encrypt captcha data with user IP and user-agent - Verifiying form element too simpleOnline Documentation : http://envato.erdemarslan.com/codecanyon/era_captcha/documentation/index.htmlOnline WorkSheet : http://envato.erdemarslan.com/codecanyon/era_captcha/documentation/worksheet.html