Another game is free this weekend as you can play Arma 3 on Steam through Sunday afternoon with no obligation. This doesn't get front-page treatment from Steam News, but this post has the details:

Spread the word: you can play Arma 3 for FREE this entire weekend on Steam!

Be deployed to the Mediterranean Republic of Altis & Stratis, and enlist for Bootcamp, create your own scenarios in the 3D Editor, or head straight into multiplayer with friends. How? Just visit your Steam Library, search for "Arma 3", and LMB fire at that Install button.

In addition, to sign up for extended duty, this weekend you can purchase Arma 3 at its lowest price ever. Take advantage of the massive 50% discount on the Arma 3 base game (which was already reduced in price just 3 weeks ago), or 33% off the Arma 3 Apex Edition (includes Arma 3 + DLC + Apex). And if you already own Arma 3, you can now also get the Karts DLC, Helicopters DLC, and Marksmen DLC (or all of them together in the DLC Bundle) at half price!