Game Server Backend - Hosted MP backend. Free.

GSB (Game Server Backend) is a hosted backend platform for studios and indie developers building multiplayer games. It bundles the operational infrastructure a multiplayer title needs behind one API, so teams can ship the game without rebuilding backend services from scratch. The platform covers matchmaking, leaderboards with global and regional scopes, player profiles, persistent JSON state per user, a server registry for community-server discovery, in-game economy primitives, and a live-ops configuration layer that lets you push gameplay tuning without a client patch. Three authentication paths are supported out of the box: anonymous accounts that upgrade later, passwordless email sign-in, and Steam OpenID for PC titles. Drop-in SDKs ship for Unity, Unreal Engine, and Godot. Each one wraps the underlying REST layer in idiomatic, type-safe APIs so existing engine patterns work without ceremony.