Resident Evil Chronicles HD Collection, ICO, GTA: Liberty City Stories, Rayman Origins and Galaga Legions DX are coming to PlayStation Plus subscriber's Instant Game Collection for the month of September. So if you're a member and have a PS3 and/or PS Vita, you should be quite happy. If you're not a subscriber, you're pretty silly.
RE, ICO and Galaga Legions DX are all PS3 releases, and Rayman Origins and GTA: Liberty City Stories are PS Vita freebies. Sony hasn't revealed when each of these will be released during the month, but we doubt that matters.
Head on over to the official PS Blog for more info on each.