Free things released on August 19:
As part of The Pinball Arcade sale: the base pack (Black Hole, Theatre of Magic, Ripley's Believe It or Not, Tales of the Arabian Knights) is free for everyone:
PS4 version (requires the free base game installed to play, Tales of the Arabian Knights included in free game)
PS3 and Vita versions have cross-buy. Both are also in the Price Drops section, so they could be permanent price drops. PS4 version might be permanent, but for now, assume it is temporary.
Other free things:
Akiba's Trip: Undead & Undressed:
Dead or Alive 5 Ultimate:
Killzone Shadow Fall:
Intercept Co-op Maps (requires Intercept Co-op add-on or Intercept Co-op standalone version installed)
Mugen Souls Z:
AR Studio (requires tablet or smartphone with PlayStation app to use this, not compatible with Vita)
PlayStation Vita Pets:
Sword Art Online: Hollow Fragment:
Tales of Xillia 2:
Free avatars from Diablo III: Reaper of Souls Ultimate Edition:
As always, downloaded avatars can only be changed on a PS3.