Sony announced the games that will be available for free to Playstation Plus members for the month of October 2017. There are a total of 6 games available, a couple being cross-buy.
Metal Gear Solid V: The Phantom Pain | PS4
Amnesia: Collection | PS4
Monster Jam Battlegrounds | PS3
Hustle Kings | PS3
Hue | PS Vita (Cross Buy with PS4)
Sky Force Anniversary | PS Vita (Cross Buy with PS4 & PS3)
All six games listed above will be free to download starting on Tuesday, October 3rd. As a reminder, you need to have an active subscription to PlayStation Plus in order to download them for no cost. Also, these games will only playable if you have an active PS+ account.