Just yesterday the first version of Rain was released. Already improvements have been made. Go to Download in the main menu to get your copy for free! If you want the up/down voting feature you see here, you just need to install the bbPress Voting plugin.
— Changelog —
Installing a separate main menu plugin is no longer required
New simple responsive menu added
Several styling adjustments were made
Added a few tags/code in preparation of adding the theme to the official WordPress theme repository (they require things to be a certain way)