An exceptionally powerful WordPress anti-spam plugin that eliminates comment spam, trackback spam, contact form spam & registration spam.
Anti-Captcha is a transparent spam solution that does not require any end-user interaction.
Helps adding a precise Safe Harbor compliant, CRM alike Double Opt Contact Form to User's profile.
SiteBrains blocks spam posts using a completely configurable set of rules. Both interactively as the user types and on our servers upon submission.