Captchas and anti-spam Gems

#Total RankDaily RankNameSummary
1725595recaptchaHelpers for the reCAPTCHA API
21,259981invisible_captchaUnobtrusive, flexible and complete spam protection for Rails applications using honeypo...
32,2631,684voight_kampffVoight-Kampff detects bots, spiders, crawlers and replicants
43,9085,715rakismetRakismet is the easiest way to integrate Akismet or TypePad's AntiSpam into your Rails ...