FreeXperia is a group of CyanogenMod Xperia maintainers.

CyanogenMod is a community enhanced distribution of Android for a wide variety of phones and tablets.

Visit CyanogenMod for documentation, wiki, and the forums.

Google+ Comunities : FreeXperiaProject

Source code is on main CyanogenMod repo
http://github.com/CyanogenMod and patches can be submitted through http://review.cyanogenmod.com/

Bugtracker
http://code.google.com/p/freexperia/issues/list
This Google Code site is only for bug reports.