WoW:Cosmos (AddOn)

A set of UI mods available at the Cosmos home page.

You can hopefully download Cosmos here. Download Cosmos.exe into your World of Warcraft folder, then run it. Click Configure, and select the version you want to use -- the "Alpha (SVN Mirror)" version is recommended. The downloader will set up Cosmos for you; you can run Cosmos.exe again at any time to make sure you have the latest updates.

Cosmos has its own forums, available here.