While the recent new release of Cube2: Sauerbraten didn't bring any really big changes, the network of friendly forks keeps expanding. But before I go into more details, here is a new feature trailer of Cube2: Sauerbraten:
The maybe most prominent and fully FOSS fork RedEclipse is still working on the promised new 1.4 release, with them doing some silly and some cool enhancement projects in the meantime... so yeah:
|Red Eclipse in Valve Time tm|
Kelgar Gameplay 0.8 - Indie DB
According to their github page, content seems to be libre (CC-by or CC-by-SA) but information is a bit scarce. Even less information is available for this other fork, called SabiCube, but you can download and test their alpha.
Ok... I hope that is all... if you know of other interesting Cube2 powered projects, please comment below!