Twitter2Posts imports tweets from your Twitter account as posts within a special category.
WP Social Stats is a powerful social analytics tool that tracks the performance of your blog posts and pages at Facebook, Twitter, Google+, Pinterest, and Stumbleupon.
CampTix Event Ticketing is an easy to use and flexible event ticketing plugin.
Jetpack allows you to supercharge your WordPress site with powerful features previously only available to WordPress.com users.
Tinypass is a simple, powerful plugin that allows any online publisher to easily sell access to any type of content, whether it’s a blog post, a site subscription, a digital download, or even a pay-per-view video.
WP Super Cache is a very fast caching engine for WordPress that produces static html files.