multiplayer

A global proxy that allows anyone to host a server without port forwarding.

«Magic：The Gathering Arena» launcher.

Multiplayer-oriented source port for Doom

The Battle for Wesnoth is an open source, turn-based strategy game with a high fantasy theme. It features both singleplayer and online/hotseat multiplayer combat.

A top-down retro racing game for PC (Linux, macOS, Windows) and Android.

A free online multiplayer game. Battle with up to 16 players in a variety of game modes, including Team Deathmatch and Capture The Flag. You can even design your own maps.

Minecraft Java Edition P2P world sharing - no port forwarding, no accounts.

A free, Open Source, turn-based space empire and galactic conquest computer game.