Captchas and anti-spam Gems

#Total RankDaily RankNameSummary
1739404recaptchaHelpers for the reCAPTCHA API
21,307526invisible_captchaUnobtrusive, flexible and complete spam protection for Rails applications using honeypo...
32,2682,031voight_kampffVoight-Kampff detects bots, spiders, crawlers and replicants
43,7254,543rakismetRakismet is the easiest way to integrate Akismet or TypePad's AntiSpam into your Rails ...