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 +
How to Set Up Remote Play for Your PSP and PS3
Sony: PS4 and PS3 cross-platform gameplay 'technically possible' | TechRadar
ps3 ps vita cross play games list Off 77% - www.otostech.com
PS3 & Vita Cross-Play Games - Giant Bomb
Ps3 Cross Play Ps4 Cheap Sale, 58% OFF | www.emanagreen.com
Foosball 2012 Coming to PS3 and PS Vita, with PS Move Support and Cross Play – PlayStation.Blog
Dragons Crown Update Lets PS3, Vita, & PS4 Play Together
List of all Playstation 3 cross-play games currently available.
Remote Play with PlayStation3 1.1 Download (Free) - VRP.exe