HyperDB is an advanced database class that supports partitioning, replication, failover, and federation.
You can have simple, concise stats with no additional load on your server by plugging into WordPress.com's stat system.
Search API is a set of functions that allows developers to easily implement new search functionality for WordPress. A set of plugins to enhance the se
Sphinx Search is a plugin that uses the Search API plugin and Sphinx as a backend for searching. It searches comments, posts, and pages and also allow
Akismet checks your comments against the Akismet web service to see if they look like spam or not.
Adds MediaRSS to your RSS2 feeds. The first image in a post will be the post's thumbnail on services that support it (e.g. FriendFeed)
Batcache uses Memcached to store and serve rendered pages.
Reduces spam and troll comments by requiring commenters to answer a question.
fauxML easily converts specific fake markup into full blown XHTML. It also offers
an API for adding new fauxMLs.
Turn off comments when a post achieves a pre-set comment count
