Missing Link makes it possible to access all of EE2's major content and site management features from the front-end of your site. Edit entries, publish new content and more.
Minimize, combine & cache your CSS and JS files. Minify your HTML. Because size DOES matter.
MX GetID3() extracts useful information from MP3s & other multimedia file formats (based on GetID3 library).
A plugin that allows you to set and get custom messages and show them to your visitors in a way you want. E.g. Someone removed something from their shoppingcart, did an action succesfully, etc.