Radek Mezulanik

This plugin:
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Add 3 hidden fields to Registration form and to Comments form, that only robots can see. Plus you can choose to add validation checkbox to forms.
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Add to .htaccess file direct access protection for comments file.
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Check time user spent on page and time when user send a form.
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Disable trackbacks for past and future posts.
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Additionally you can choose to add validation checkbox to forms.

Antispam Revolution

Three way antispam protection for registration and comment forms.

bgermann

Beginning with version 14.9.1 <a href="https://wordpress.org/plugins/cforms2" rel="ugc">cformsII</a> has pluggable captcha support. This plugin makes use of that by providing an implementation for the <a href="https://wordpress.org/plugins/really-simple-captcha/" rel="ugc">Really Simple CAPTCHA</a>.

Really Simple CAPTCHA for cformsII

Beginning with version 14.9.1 cformsII has pluggable captcha support. This plugin makes use of that by providing an implementation for the Really Simp …

Antispam Revolution vs Really Simple CAPTCHA for cformsII