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.
One day, sooner or later, I will release a new patch for fix some bugs. This patch will add some new ground units.
Other improve will be a big change with the balance from the ground combat.
About the units showed here. The B-Wing is a special heavy bomber from the Alliance armed with heavy rockets, lasers and ion guns. You will note how the ground fighters/bombers can support a lot more of damage.
The Avalanche tank is heavy ground unit from the Black Sun.