Environment

[OKeez]

Eclipse with Lua editor addon. Has version control integrated for SVN, VCS, Mercurial, etc. Also, you get ANT build scripting for zipping up addons, copy to rift addon folder, etc. There's no IntelliSense for the Rift API yet and I don't expect one will be done before the full API is available...but it can be done.

Warning: Eclipse is a big install and probably overkill if you don't code in other languages...I do all my projects in Eclipse (Java, JS, C#, AS3, PHP,...)