Wordpress plugins
wp-FileManager - FileManager for WordPress allows you to easily change, delete, organize and upload files.
Theme Companion plugin for WordPress - it is now incorporated in the JetPack plugin: http://wordpress.org/extend/plugins/jetpack/
WooCommerce: An open-source eCommerce plugin for WordPress
WordPress SEO Plugin • Search Engine Optimization Plugin • Yoast
Wordpress plugin email newsletter
bbPress.org - forum software with a twist from the creators of WordPress.
Better WordPress Minify