This plugin will make your blog more secure by adding rules which spambots will not pass.

Andrei Husanu 200+ active installs Tested with 3.9.19 Updated 3 years ago

Caldera Forms – More Than Contact Forms

Responsive form builder for contact forms, user registration and login forms, Mailchimp, and more.

Caldera Labs 70,000+ active installs Tested with 4.8.0 Updated 6 days ago

Comment Spamtrap

This plugin adds 2 form fields to the comment form (hidden by CSS) to detect spam bots that autofill all form fields they find

Rob Mills 200+ active installs Tested with 2.9.2 Updated 7 years ago