Company of Heroes 2 is a fantastic WW2 Real Time Strategy, and to celebrate it's fifth anniversary, the game is available for free from Steam all weekend, and the best part is, you can keep it!
It's a sequel to the 2006 Company of Heroes, and while perhaps not quite the classic that the original was, it's still a very solid RTS and absolutely worth picking up for free.
The game features singleplayer and multiplayer campaigns, and the DLC for the game is also available at a pretty heavy discount for the weekend, which includes Western Front Armies and British Forces expansions.
So why not grab the game from Steam for free this weekend? It's yours to keep, but the offer ends December 10th, so you'll need to move quick if you're interested.