The long-running Warframe which continues to be a popular free-to-play title now has cross platform play. This means that if you play Warframe on the Nintendo Switch system and your friend plays it on the Xbox Series X|S you can hook up with them online and join in a play session with them. Sadly cross-platform save hasn’t been implemented yet which would allow you to save your progress if you play the game on two or three systems. You can read more information on how the system works in Warframe here.