Captchas and anti-spam Gems

#Total RankDaily RankNameSummary
1602793recaptchaHelpers for the reCAPTCHA API
21,0741,750invisible_captchaUnobtrusive, flexible and complete spam protection for Rails applications using honeypo...
32,3181,997voight_kampffVoight-Kampff detects bots, spiders, crawlers and replicants
44,6285,659rakismetRakismet is the easiest way to integrate Akismet or TypePad's AntiSpam into your Rails ...