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.
If you've ever played Battalion Wars for Nintendo (a classic old game).
Then this design should spark to memory Xylvania's Battlestation unit.
At least that's what it reminds me of.