Serial Cleaner
In exchange for signing up for the Humble Bundle newsletter, they're offering a free copy of the game Serial Cleaner to keep forever on Steam. Serial Cleaner is a fast paced stealth-action game with a bit of a twist: instead of taking out targets, you're the crime scene cleanup crew. Sneak past guards to get into the crime scene and get out without being caught.Prison Architect
Prison Architect is having a free weekend on Steam and you'll be able to play the game for free until Sunday night. Try to keep prisoners happy and create the perfect penitentiary in this surprisingly deep building and management sim. It's also on sale for 75% off should you want to keep playing after this weekend.Overcooked 2
Get your friends together for some great couch co-op gameplay. One of the most hectic and fun multiplayer games ever, Overcooked 2 is currently on Steam for 40% off. This might also be a great way to try out Steam's new Remote Play Together feature.Total War: Shogun 2
Travel back to feudal Japan with some classic Total War gameplay in Shogun 2. Outside of Warhammer, feudal Japan is one of the coolest setting for a Total War game. Just be careful not to get stuck in the 'one more turn' loop and realize you've been up all night. Most of the Total War games are discounted this weekend on Steam and Shogun 2 is currently 75% off.None of the above link are affiliate links.