Shadow Warrior Classic is currently Free to Play on Steam
I didn't put this in the deals section as I believe it is free for the foreseeable future.
They term it as 'Free to Play', as opposed to just 'Free'
https://store.steampowered.com/app/2..._Classic_1997/
I've never played it, I remember when it came out, but I uhm'ed and ah'ed forever and had way too many games to play at the time.
I'm going to give it a quick blast and find out what it's all about.
EDIT: As Ferrel noted, GoG are also doing this for free
https://www.gog.com/game/shadow_warrior_complete