Lambda Wars (formerly Half-Life 2: Wars) brings the struggle between the human resistance and their Combine overlords to a multiplayer real-time strategy setting. The Lambda Wars beta only requires Alien Swarm installed to play. It features 3 multiplayer game modes: Sandbox, Annihilation and Overrun, showcasing the Rebels and Combine playable factions and a full-fledged RTS interface and HUD. There is also a singleplayer tutorial and a handful of singleplayer missions.
The Mech Factories' and Canister Launchers' (i.e. the buildings made later than the others) team color textures were dim and it was hard to distinguish the Reds from the Pinks, the Greens from the Dim greens, generally speaking, the Brights from the Dims. It's not the case anymore ;)
P.S. Team-colored the Combine Garrison roof, it being grey and bearing the logo kinda made no sense.