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.

Andrea De Giovine

Do you like the WP Firewall plugin? Leave a <a href="https://wordpress.org/support/plugin/wp-firewall/reviews/?filter=5" title="Review this plugin" rel="ugc">5 star review</a> to recommend it to other users.
This plugin adds a set of protection rules to the .htaccess file of your WordPress site. 
These rules totally protect the CMS from hacker attacks.
This is a BETA version, if you find bugs or malfunctions contact the developer from the support section.
<h3>WP Firewall requirements</h3>
<ul>
<li>Apache web server</li>
<li>ModRewite</li>
<li>SSL connection (https)</li>
</ul>
<h3>WP Firewall development functions</h3>
This plugin uses only functions contained in the CMS core.
Do you need other functions? Ask the developer from the support section.
If after activating the protection errors or white screens occur, access the .htaccess file and remove all the code between “# BEGIN Firewall” and “# END Firewall”.
<h3>WP Firewall credits</h3>
The “WP Firewall” plugin was entirely designed and created by Andrea De Giovine (thought by @riccardobastillo1). 
If you like the idea and want to support the developer, please <a href="https://www.andreadegiovine.it/outlinks/1422/?utm_source=wordpress_org&utm_medium=plugin_page&utm_campaign=wp_firewall" title="send donation" rel="nofollow ugc">donate to this plugin</a>. 
For collaborations and consultations visit the website of the <a href="https://www.andreadegiovine.it/?utm_source=wordpress_org&utm_medium=plugin_page_text&utm_campaign=wp_firewall" title="Web developer freelance" rel="nofollow ugc">freelance web developer</a>. 
For bug reports and support for this plugin, visit the <a href="https://wordpress.org/support/plugin/wp-firewall/" title="Go to support" rel="ugc">support</a> section to ask the developer and the community directly.

WP Firewall

Protect WordPress from hacker attacks, spam and dangerous actions.

Antispam Revolution vs WP Firewall