Honeypot
A spam prevention module that uses honeypot fields and time-based restrictions to deter automated form submissions without using CAPTCHAs.
Tags
form protection
reCAPTCHA
Integrates Google reCAPTCHA service with Drupal's CAPTCHA module to protect forms from spam and abuse.
CAPTCHA
Provides CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) functionality to protect web forms from automated spam submissions.
Spam Master
Real-time firewall and anti-spam protection module that blocks malicious user registrations, comments, and form submissions using RBL (Real-time Blacklist) servers provided by spammaster.org as SaaS.