gregbialowas

GB Anti-Spam for Contact Form 7 adds a lightweight security layer to Contact Form 7 forms without CAPTCHA.
Features: 
* Honeypot field protection 
* Timing-based bot detection 
* Request integrity token 
* IP rate limiting 
* Automatic injection (no manual form editing required)
Designed to be lightweight and compatible with caching and performance plugins.

GB Anti-Spam for Contact Form 7

Lightweight anti-spam protection for Contact Form 7 without CAPTCHA. More details: https://gregbialowas.com/anti-spam-cf7

Otto Kekäläinen

Viljami Kuosmanen

This plugin fights comment and registration spam on your website. This plugin is based on the Open Source WP No-Bot plugin at http://www.compdigitec.com/apps/wpnobot by Compdigitec.
This plugin is authored by <a href="http://seravo.fi/" rel="nofollow ugc">Seravo Oy</a>, which specializes in open source support services and among others is the only company in Finland to provide <a href="http://seravo.fi/wordpress-palvelu" rel="nofollow ugc">WordPress Premium Hosting</a>.
Source available at https://github.com/Seravo/wp-spam-question-filter

WP Spam Question Filter

This plugin fights comment and registration spam on your website.

GB Anti-Spam for Contact Form 7 vs WP Spam Question Filter