By the way, I don't usually mention it here because it's basically a weekly thing, but for those who don't know, there's a new set of games pretty much every week on Amazon which you can claim for free if you have Amazon Prime. Some redeem on GOG, some redeem on Epic, and some redeem on other things. And the redemption period is pretty generous. Each giveaway seems to last about 4-6 weeks, so if you forget to check a week or two, there's a good chance you won't miss out.
https://gaming.amazon.com/homeIf I counted correctly there are 65 games being given away right now, including 32 games that can be redeemed on GOG, 16 on Epic, 16 on Amazon Gaming, and 1 on Legacy Games.
Not all are worth claiming, IMO, but there's probably something for just about everyone in the selection.