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.
I continue working at least one or two days per week at my Sins of a Solar Empire Rebellion mod. Today I have added the Death Stars, I say Death Stars because there are more of one, in fact the first builded is the Death Star Prototipe and after it you can upgrade it to the Death Star I and after it to the Death Star II. Have fun.