I am a bit late for the party for some of these, but they are still available for free.
Rayman Legends is free on Uplay until tomorrow.
Totally Reliable Delivery Service is free on Epic until 08 April.
Autobahn Police Simulator is free on Steam until 07 April. This game has mostly negative reviews though. I am interested to see what the keyboard driving is like.
Drawful 2 is free on Steam until 10 April and free on Epic until 09 April. This is a local multiplayer only game.