Captchas and anti-spam Gems

#Total RankDaily RankNameSummary
1747598recaptchaHelpers for the reCAPTCHA API
21,3931,025invisible_captchaUnobtrusive, flexible and simple spam protection for Rails applications using honeypot ...
32,2641,922voight_kampffVoight-Kampff detects bots, spiders, crawlers and replicants
43,6413,507rakismetRakismet is the easiest way to integrate Akismet or TypePad's AntiSpam into your Rails ...