Half Life: Tactics (HLT) is a HL2 modification that aims to create a turned based strategy game set in the HL2 universe. The game aims to take four factions: Rebels, Combine, Antlions, and Zombies, with a player choosing a faction to command. The players take turns in commanding their units, and the game will be focusing on unit control and tactics rather than base building. It is still in very early development, but is being worked on nearly every day. More info coming soon!
Pics showing a concept grid/map made by a buddy and a pic showing a concept of the movement system for the units.
I see that you finally got around to posting the pics :D