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/
This Google Code site is only for bug reports.