For more than a decade, a group of fans has been working Lambda Wars, a real-time strategy game set in Half life universe. Originally a Half-Life 2 mod and subsequently an independent beta, the thing is already over, or as finished as a game ever gets, anyway.
After development began in 2007, the team announced the release of v1.0 on Sunday, noting how it has “progressed from a proof of concept to an asymmetric RTS game complete with Singleplayer, Co-op and Multiplayer game modes.” .
Version v1.0 added new drives, buildings, bug fixes, and remodels, and is available for free from Lambda Wars’ Steam page.
I remember playing this one long time ago and digging it up while Nathan played the game in 2014 and wrote about it on the site. Perhaps most interesting in this regard is, as they say, its “asymmetrical” nature. The (human) rebels are totally unable to compete with the overwhelming military force of the combined in a direct encounter, so the two factions play completely different.