Well, not really for free. You still need to shell out less than US$5 a month to become a PlayStation Plus member. But once you do, you'll get your own library of games.
Starting today, PlayStation Plus members automatically get the following games: Virtua Fighter 5, inFAMOUS 2, Little Big Planet 2, Ratchet and Clank: All 4 One, Warhammer 40,000: Space Marine, Just Cause 2, Saints Row 2, Lara Croft and the Guardian of Light, Hard Corp: Uprising, Choplifter HD, Zombie Apocalypse Never Die Alone, and Sideway NY.
The offer is a big change for the service, and PlayStation Plus members still get an array of online perks, like priority beta access and game discounts. This also comes hot on the heels of PlayStation Plus members getting half-priced complete editions of major games.