Deus Ex: Human Revolution, Machinarium, Saints Row: The Third, Orc Attack, God Eater Burst, and Zero Escape: Virtue's Last Reward are joining the Instant Game Collection for PlayStation Plus subscribers this month. And apparently not all of the June additions have been listed yet!
Depending on the gaps in your library, that's a potentially great line-up. Vita owners, in particular, should not miss out on this opportunity to play Virtue's Last Reward.
PlayStation Plus: Deus Ex: Human Revolution Free for Members [PlayStation Blog]