Outbreak will allow cross-play between 2 platforms

Outbreak
Release Date: Jan 17, 2017
Official Website: Link
Supported game modes:
  • Single player
  • Multiplayer
  • Co-operative
Supported player perspectives:
  • Bird view / Isometric
Crossplay platforms:
Outbreak will support cross-play across multiple platforms. It will be possible to play together with your friends on Windows PC and Linux. Please check out all the details on the game's official website!
Cross-Platform Combination Details:
Source: Link
Additional Info: Outbreak supports native online play on PC and have native Linux versions. They should be cross platform online co-op capable. The console versions do not support online play though!
Summary:
Explore a nightmarish environment, scrounge for supplies, and battle the undead in Outbreak -- an online co-op survival horror game. The clock never stops as you attempt to manage an extremely limited inventory with a murderous horde on the hunt. Choose between acquiring additional weapons, healing items, or necessary tools for progression. You have only one life. Make it count!
Screenshots:
Image 1Image 2Image 3Image 4
Artworks:
Image 1
Supported game modes:
  • Single player
  • Multiplayer
  • Co-operative
Supported player perspectives:
  • Bird view / Isometric