Homefront, the game made by the now defunct Kaos Studio (the folks that originally worked on Battlefield 2 and got fired a couple of months before release), IS FREE till 24:00 CET of December the 8th on HumbleStore.

In case you forgot about it, Homefront released in March 2011 and it is SET IN A NEAR FUTURE WHERE NORTH KOREANS ACTUALLY SUCCESSFULLY INVADED NORTH AMERICA.

From what I remember there was a good chunk of hype before the release of the game and, after a short while it came out, it was sadly a mixbag of A FORGETTABLE BUT COMPETENT SINGLE PLAYER campaign and A DECENT MULTIPLAYER THAT DIDN'T STAND OUT.

If you want to give a shot to this little piece of gaming history, go grab the Steam key at this LINK