Drupal-Builder

Mollom provides a one stop solution for all spam problems and can protect the following Drupal forms. It offers and intelligently combines:

• CAPTCHAs -- both image and audio CAPTCHAs
• text analysis
• user reputations

and can:

• block comment form spam
• block contact form spam
• protect the user registration form against fake user accounts
• protect the password request form
• block spam on any node form, such as forum topics, articles, stories, pages, and more