War Thunder allows cross-play between 5 platforms

Supported crossplay platforms
Release Date: Jan 28, 2013
Official Website: Link
Summary:
War Thunder is an MMO combat game dedicated to World War II military aviation, armored vehicles and fleet. You will take part in all of the major combat battles, fighting with real players all over the world. Become a lone hero or lead your team to victory — the choice is yours! War Thunder offers a highly detailed and personalized aviation experience, giving players access to hundreds of historically accurate planes with detailed cockpits, dozens of upgrade able weapons, and flying skills that can be honed and improved with each mission. Thanks to the game’s painstaking attention to detail, you’ll truly feel like a World War II fighter pilot as you plunge into battle.
Supported crossplay platforms:
War Thunder is supporting cross-play across multiple platforms. Currently it is possible to play together with your friends on Windows PC, Playstation 4, XBox One, Linux and Mac. Be aware that War Thunder has mutually exclusive combinations. That means not all listed platforms are able to crossplay with each other. Check out all possible combinations in the sidebar.
War Thunder is also known as:
  • World of Planes
Supported game modes:
  • Single player
  • Multiplayer
  • Co-operative
  • Massively Multiplayer Online (MMO)
Supported player perspectives:
  • First person
  • Third person