Luanti (formerly Minetest) is an open-source voxel game engine for building and hosting modded games and multiplayer worlds with Lua-based modding.

13.5k stars2.4k forkslast commit Actively maintained
Subscription hosting service from Mojang/Microsoft that provides managed, always-on Minecraft servers (Realms) for Java and Bedrock editions. Enables private worlds, multiplayer sessions, player invites, backups and basic server administration.
Luanti (formerly Minetest) is an open-source voxel game engine for building and hosting modded games and multiplayer worlds with Lua-based modding.

13.5k stars2.4k forkslast commit Actively maintained
OpenTTD is an open-source transport simulation game based on Transport Tycoon Deluxe, featuring deep logistics gameplay, modding support, and multiplayer.

8.2k stars1.3k forkslast commit Actively maintained
Veloren is an open-source voxel action-adventure RPG with procedural world simulation, fast-paced combat, crafting, NPC towns, dungeons, and multiplayer servers.

Activity unknown
Every option on this page is open source and free to run on your own hardware, so you own the data and there is no subscription to cancel. 2 of 3 shipped a commit in the last six months. In exchange you take on hosting, backups and updates yourself.
Browse everything in Compute & Virtualization (VM/Hypervisor Management).