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

wpdebuglog

This is a highly powerful contact form 7 anti-spam add-on. It is introducing a new hidden field and check that one value is correct or not.
<h4>Features of Contact Form 7 Honeypot Plus</h4>
<ul>
<li>No configuration is needed</li>
<li>Better anti-spam functionality</li>
<li>No need any ugly captcha.</li>
</ul>

Honeypot Plus for Contact Form 7

Nice plugin

Honeypot Plus for Contact Form 7 - Adds honeypot plus anti-spam functionality to Contact Form 7 forms.

GB Anti-Spam for Contact Form 7 vs Honeypot Plus for Contact Form 7