Dragon's Dogma Online allows cross-play between 3 platforms

Supported crossplay platforms
Release Date: Aug 27, 2015
Summary:
A Free 2 Play online full open world game for the PS3, PS4 and PC.
Genres and Themes: Role-playing (RPG) Action
Supported crossplay platforms:
Dragon's Dogma Online is supporting cross-play across multiple platforms. Currently it is possible to play together with your friends on Windows PC, Playstation 3 and Playstation 4.
Supported game modes:
  • Massively Multiplayer Online (MMO)
Supported player perspectives:
  • Third person