Alliance are a serie of different mods. On the Star Wars GC, you can play the civil war Empire vs Rebel era + Black Sun and soon the Republic and CIS.
For the next update in steam, I have added some new models for some planets with a different and better view.
Best addition is probably Tralus/Talus, Sulon and Narshadda between others. Probably I will add more sooner or later.