100% off Distant Space and Weapon of Choice DX on Steam:
https://store.steampowered.com/app/569610/Distant_Space/
https://store.steampowered.com/app/373600/Weapon_of_Choice_DX/
https://www.notebookcheck.net/Two-well-rated-indie-games-are-available-for-free-on-Steam-for-a-short-time.878519.0.html
Free to Play:
https://store.steampowered.com/app/2398520/Classic_Marathon_Infinity/
https://slickdeals.net/f/17708517