Dragon's Crown gets PS3 to Vita cross-play with upcoming patch - Polygon
Amazon.com: Ratchet & Clank: Full Frontal Assault - Playstation 3 : Sony Computer Entertainment America: Video Games
PS3 & Vita Cross-Play Games - Giant Bomb
How to set up the Remote Play with PlayStation® 3 software. | Sony USA
Portal 2 on PS3 was the only Valve game on console to be cross play and cross progressions with PC via logging into steam on your PS3 and you'd get steam achievements +
Are there any games that are cross platform between Xbox 360 and PS3? - Quora