October's free games are Mortal Kombat X, Hell Let Loose and PGA Tour 2K21. PS5 owners also get access to the PlayStation Plus Collection, a set of classic PS4 games, for free.
Once you've downloaded them, you keep these games for as long as you want - they don't expire after the month is up. It's far from the Xbox Game Pass, the subscription service featuring over a hundred titles that Microsoft is building the Xbox Series X|S around, but there are some amazing deals to be found, especially if you keep an eagle eye on the monthly selection of free games.