You can have simple, concise stats with no additional load on your server by plugging into WordPress.com's stat system.
Provides single sign on login with a bbPress installation.
Create and manage PollDaddy polls from within WordPress.
WP LaTeX creates PNG images from inline $\LaTeX$ code in your posts and comments.
Akismet checks your comments against the Akismet web service to see if they look like spam or not.
HyperDB is an advanced database class that supports partitioning, replication, failover, and federation.
Easily post source code such as PHP or HTML and display it in a styled box.
Visitors to your site can preview their comments with a click of a button.
Draft Notifier sends a notification email to your blog's admin address when a post written by a Contributor is Submitted for Review.
Display links to your most 'interesting' posts, where interestingness is determined automatically by a Bayesian learning algorithm.
Add a contact form to any post or page by inserting "[contact-form]" in the post. Emails will be sent to the post's author. As seen on WordPress.com.
A WordPress MU plugin. Gives blog Administrators and Editors the ability to post whatever HTML they want. "Evil" tags will not be stripped.
On a category's archive page, displays only the posts directly in that category, not in any sub-categories.
Adds "Sidebar Widgets" panel under Presentation menu
fauxML easily converts specific fake markup into full blown XHTML. It also offers
an API for adding new fauxMLs.
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