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.
Sunday update! I have added a new fighter/bomber damage system explained here in the end of this tread Steamcommunity.com
And the new update add some small improves and two new skirmiss units. The First Order AT-ST and the TIE Silencer.