Captchas and anti-spam Gems

#Total RankDaily RankNameSummary
1797850recaptchaHelpers for the reCAPTCHA API
22,1121,781invisible_captchaUnobtrusive, flexible and simple spam protection for Rails applications using honeypot ...
32,3731,889voight_kampffVoight-Kampff detects bots, spiders, crawlers and replicants
43,4305,010rakismetRakismet is the easiest way to integrate Akismet or TypePad's AntiSpam into your Rails ...