Plugins can extend WordPress to do almost anything you can imagine. In the directory you can find, download, rate, and comment on all the best plugins the WordPress community has to offer.
bbPress is forum software, made the WordPress way
Supercharge your WordPress site with powerful features previously only available to WordPress.com users.
A very fast caching engine for WordPress that produces static html files.
Social networking in a box. Build a social network for your company, school, sports team or niche community.
Import posts from a Tumblr blog.
Provides unofficial fixes for selected WordPress bugs, so you don't have to wait for the next WordPress core release.
A simple and easy way to test your theme for all the latest WordPress standards and practices. A great theme development tool!