https://store.epicgames.com/en-US/p/empyrion-galactic-survival-fbd99f -click the get button to get a Free Empyrion – Galactic Survival PC Game Download from Epic Games.
https://store.epicgames.com/en-US/p/outliver-tribulations-679884 -click the get button to get a Free Outliver: Tribulation PC Game Download from Epic Games.
https://www.xbox.com/en-US/? –login to your Xbox account on the US website here first.
Then go here and click the green button(your browser may be able to translate that page), to get the game for free added to your xbox account.
Glitch Games currently has these iOS games for free. They’re mostly puzzle games:
https://store.epicgames.com/en-US/p/ghostrunner -click the get button to get a Free Ghostrunner PC Game Download from Epic Games.
https://store.epicgames.com/en-US/p/art-of-rally -click the get button to get a Free Art of Rally PC Game Download from Epic Games. Ends tomorrow at 11AM.
https://store.epicgames.com/en-US/p/melvor-idle-b6a9b3 -click the get button to get a Free Melvor Idle PC Game Download from Epic Games. Ends tomorrow at 11AM.
https://mailchi.mp/841f564080b9/nggnewslettergiveaway -sign up for their newsletter on that page to get a Free copy of Pirates: All Aboard today only. Once you own that game(or any No Gravity game), you’ll qualify to get a Free game every day until December 20.
The free games will be listed daily at this link starting on Monday, December 11, but you have to do it every day or you won’t qualify for the future free games. The free pirates games doesn’t seem to come immediately, so hopefully they send the code before the promotion starts on Monday.
https://www.nintendo.com/store/products/just-dance-switch/ -Nintendo Switch owners can get a Free Just Dance Game Download in the Nintendo Store.
https://store.epicgames.com/en-US/p/adios-b378b4 -click the get button to get a Free Adios PC Game Download from Epic Games.
https://store.epicgames.com/en-US/p/hell-is-others-789262 -click the get button to get a Free Hell is Others PC Game Download from Epic Games.