Pox Nora allows cross-play between 3 platforms

Supported crossplay platforms
Release Date: Aug 1, 2004
Official Website: Link
Summary:
Pox Nora is a collectible, turn-based, tactical, online fantasy game. Players command armies of fantastic creatures, cast spells of devastating power, and summon relics and equipment of ancient renown in order to defeat their opponents.
Supported crossplay platforms:
Pox Nora is supporting cross-play across multiple platforms. Currently it is possible to play together with your friends on Windows PC, Playstation 4 and Mac.
Pox Nora is also known as:
  • PoxNora
Supported game modes:
  • Single player
  • Multiplayer
  • Massively Multiplayer Online (MMO)
Supported player perspectives:
  • Bird view