Captchas and anti-spam Gems

#Total RankDaily RankNameSummary
1690474recaptchaHelpers for the reCAPTCHA API
21,1761,234invisible_captchaUnobtrusive, flexible and complete spam protection for Rails applications using honeypo...
32,2452,081voight_kampffVoight-Kampff detects bots, spiders, crawlers and replicants
44,3864,908rakismetRakismet is the easiest way to integrate Akismet or TypePad's AntiSpam into your Rails ...