Captchas and anti-spam Gems

#Total RankDaily RankNameSummary
1726529recaptchaHelpers for the reCAPTCHA API
21,2081,088invisible_captchaUnobtrusive, flexible and complete spam protection for Rails applications using honeypo...
32,2742,199voight_kampffVoight-Kampff detects bots, spiders, crawlers and replicants
44,1243,677rakismetRakismet is the easiest way to integrate Akismet or TypePad's AntiSpam into your Rails ...