Captchas and anti-spam Gems

#Total RankDaily RankNameSummary
1690452recaptchaHelpers for the reCAPTCHA API
21,172909invisible_captchaUnobtrusive, flexible and complete spam protection for Rails applications using honeypo...
32,2612,031voight_kampffVoight-Kampff detects bots, spiders, crawlers and replicants
44,4214,012rakismetRakismet is the easiest way to integrate Akismet or TypePad's AntiSpam into your Rails ...