L2 Universe it is based on freya ;)
As far as i know there is no another1 project (freya) except l2j ( no it is H5) and L2universe...
l2j is reall good coded and as Zake says more retail-like ,but needs a lot of work to be a good and stable Server core
From the other hand l2 universe as all know it is based on l2j ,so what else do you want to tell you ? It is just a compiled l2j server core with more features (not da best )