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Mimic Guard is an anti-spam plugin for WordPress mail and contact forms. It uses dynamic honeypots, submission time monitoring, and integration with major form plugins to reduce automated bot submissions.
<ul>
<li>Honeypot — Detects bots that fill hidden form fields</li>
<li>Time check — Flags submissions that are unrealistically fast after the form is shown</li>
<li>Form integration — Works with WPForms, Contact Form 7, comments, and more</li>
<li>Page caching — Optional AJAX honeypot injection when HTML is cached</li>
<li>Privacy — Optional IP anonymization when logging events</li>
</ul>
Configure minimum submission time, token lifetime, log list size, and more from the admin screens.

Mimic Guard

Block spam submissions with honeypot fields and submission timing checks.

WP-Biz (Ryan)

The “honeypot” technique for SPAM protection is invisible to humans, and tricks robots into filling out an invisible form field. Then, if that invisible field has been filled, the form cannot be submitted. Easy, non-instrusive SPAM protection.
No settings to set, this honeypot is added to all Formidable forms on your site, unless the user is logged in. When SPAM is suspected, the form will not be submitted and the visitor will be alerted to this fact.
Tested to work with both Formidable (free) and <a href="http://www.wpbiz.co/go/forms" rel="nofollow ugc">Formidable Pro</a> (best bet for awesome form power!)
A note to Formidable Pro users: You paid to receive extra features in the Formidable plugin. Me too, it’s well worth it. This Honeypot plugin, and Ryan (the developer) are not connected to Formidable in any way. Since this adds another very helpful feature to Formidable, I ask you to send a <a href="http://wpbiz.co/donate/" rel="nofollow ugc">donation at WPbiz.co</a> to say thanks and encourage future developemnt.

Formidable Honeypot

Add SPAM protection to your Formidable forms without annoying your visitors with Captchas, math, or other fields.

Mimic Guard vs Formidable Honeypot