The "soft" hardcore Gregtech modpack. Hence the codename Cat.
If you wish to contribute, simply download the Github Desktop Client, clone the repository found here, make your changes, submit them as a pull request, and you shall be credited!
TESTERS:
If you are a tester, and you want to tell us about an issue, please submit an issue via GitHub or through the FTB forum thread: http://forum.feed-the-beast.com/threads/cqi-modpack-creation.58869/