You can get Metal Gear Solid V: The Phantom Pain with your PlayStation Plus membership in October. There's also the Amnesia collection, which has both The Dark Descent and A Machine for Pigs, two games I'm too scared to play.
As always, these games are only "free" if you have an active PlayStation Plus account.
October's PS Plus lineup is:
- Metal Gear Solid V: The Phantom Pain
- Amnesia: Collection
- Monster Jam Battlegrounds
- Hustle Kings
- Hue (crossbuy with PS4)
- Sky Force Anniversary (crossbuy with PS4 and PS3)