This library can help you create a captcha in your terminal application, which may be damaged by a large influx of requests.

AntiCaptcha api ruby wrapper

Display and verify arcaptcha service captcha

Antispam helps prevent spam in your Rails applications by checking against DNS blacklists and spam-prevention databases. It has two core features: (1) IP-based spam detection using Project Honey Pot to block known spammers automatically, and (2) content-based spam detection using Defendium’s mach...

Solve Media CAPTCHA Replacement

A captcha that uses images instead of garbled text

Define questions and answers in a YAML file and validate your models with a single line of code. No more captchas or other stupid tricks.

Helps humankind with simpler captchas

A honeypot style captcha extension for ActiveRecord. Simple one-line inclusion in the model combined with a simple form field should trap the bad guys in the molasses.

Generates Text Catpchas, that are 'nice' by my own personal definition!

Simple captcha image generator gem

This gem enable to use Captchme. Anti spam, Monetize captcha and Audience qualification

jQuery slide captcha system with jQuery & jQuery UI for Rails 3