It looks like Square-Enix is giving out Tomb Raider for a limited time. Lara Croft and the Temple of Osiris is also being offered. Hurry, the offer ends on 3/23/20! Follow the links below to get your copy on Steam.

https://store.na.square-enix-games.com/en_US/product/604614/tomb-raider-steam
https://store.na.square-enix-games.com/en_US/product/604617/lara-croft-and-the-temple-of-osiris-steam

*Update* I just watched a video from one of my YouTube subscriptions which mentions these two games along with three others. Check out the video, which contain links to the games in the video's description. I've embedded the video in this post.

*Newer Update* I found a huge list of free games being offered now. Check it out: https://www.gamespot.com/articles/dozens-of-games-are-free-to-claim-this-weekend/1100-6474874/