Captchas and anti-spam Gems

#Total RankDaily RankNameSummary
1639419recaptchaHelpers for the reCAPTCHA API
21,075762invisible_captchaUnobtrusive, flexible and complete spam protection for Rails applications using honeypo...
32,2842,109voight_kampffVoight-Kampff detects bots, spiders, crawlers and replicants
44,5724,637rakismetRakismet is the easiest way to integrate Akismet or TypePad's AntiSpam into your Rails ...