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Akismet checks your comments against the Akismet web service to see if they look like spam or not.

Out-of-the-box SEO for your Wordpress blog.

A tag cloud plugin for WordPress to give you more flexibility with the styling of your tag cloud.

Deactivates the visual editor for specific pages or posts.

Executes <?php ?> code in your posts, pages and text widgets.

Like the Text widget, but it will take PHP code as well. Heavily derived from the Text widget code in WordPress.

This plugin makes it simple to add Google Analytics with extra search engines and automatic clickout and download tracking to your WordPress blog.

This plugin will generate a special XML sitemap which will help search engines like Google, Yahoo, Bing and Ask.com to better index your blog.

Automatically crossposts your WP entries to your LiveJournal or LJ based clone.

Manage all your 301 redirects and monitor 404 errors

Removes common words like ‘a’, ‘the’, ‘in’ from post slugs to improve SEO.

List bookmarks from one bookmark category for WordPress 2.3+. Licensed under GPL v2.

Automatically add links on your posts, pages and RSS feed to your favorite social bookmarking sites.

A complete integration between your WordPress blog and Twitter. Bring your tweets into your blog and pass your blog posts to Twitter. Show your tweets in your sidebar, and post tweets from your WordPress admin.

Makes use of Gravatars and MyBlogLog Avatars, places Gravatars, OpenAvatar, Wavatar, Identicon, monsterID or MyBlogLog Avatars in the comments section. Uses the comment authors email to display their Gravatar. It also gives the user an Author Profile picture, based on his or hers Gravatar. Developer blog at this site.

An SEO-enhanced pagination control for WordPress.

Originally developed by Ryan Duff, modified and enhanced by Doug Karr.

Perform security scan of WordPress installation.

Very fast caching plugin for WordPress.

Outputs a fully customizable breadcrumb path.