darrinb

Easily include raw markup languages (HTML, CSS, PHP, etc.) in comments using custom quicktags. No need to encode, the filter does it for you. Creates convenient “encode” buttons for comment authors in the HTML editor.
Also adds basic quicktag buttons on the comment forms, using the Quicktag API built into WordPress (as of 3.3).

WP Comment Encode

Ralf Weber

No more SPAM by spiders scanning you site for email addresses. With CryptX you can hide all your email addresses, with and without a mailto-link, by converting them using javascript or UNICODE.
CryptX protects your email addresses from spam bots while keeping them readable and functional for your visitors. The plugin automatically detects email addresses in your content and encrypts them using various methods including JavaScript encryption, Unicode conversion, and image replacement.
Key Features:
<ul>
<li>Automatic Email Detection – Finds and encrypts email addresses in posts, pages, comments, and widgets</li>
<li>Multiple Encryption Methods – JavaScript, Unicode, image replacement, and custom text options</li>
<li>Widget Support – Works with text widgets and other widget content</li>
<li>RSS Feed Control – Option to disable encryption in RSS feeds</li>
<li>Whitelist Support – Exclude specific domains from encryption</li>
<li>Per-Post Control – Enable/disable encryption on individual posts and pages</li>
<li>Shortcode Support – Use <code>[cryptx]email@example.com[/cryptx]</code> for manual encryption</li>
<li>Template Functions – Developer-friendly functions for theme integration</li>
</ul>
<a href="http://weber-nrw.de/wordpress/cryptx/" title="Plugin Homepage" rel="nofollow ugc">Plugin Homepage</a>

CryptX

No more SPAM by spiders scanning you site for email addresses!

WP Comment Encode vs CryptX