Survive the outbreak on your own Project Zomboid server.

Project Zomboid ships two relevant branches, and your server can run either. Build 41 is the long-standing stable multiplayer build — it's the default, and the right choice for a campaign you don't want to babysit. Build 42 is the unstable branch with active updates and the newer feature set; you flip the Steam beta branch to unstable in the server settings and the game files re-download, with your world preserved.

Mods come from the Steam Workshop. Add Workshop IDs and mod IDs to the server config from the file manager, restart, and the server pulls them automatically — the same WorkshopItems / Mods lines you'd edit on a local host. Popular collections (Brita's, common map packs, QoL mods) work the way you expect.

A few sizing notes: Project Zomboid loads map cells around every player, so RAM use scales with how spread out your survivors are, not just headcount. Survivor (5 GB) suits a small group on one town; Outbreak (10 GB) handles an active server roaming the map; Apocalypse (16 GB) is for large communities or heavily-modded worlds. Resize from the dashboard without losing your save. The full catalogue is on /games.