Moongate – Ultima Online server emulator in .NET 10 with Lua scripting

In plain words

Moongate is a server emulator for the classic Ultima Online game, built in .NET 10 with foundational systems for login, movement, items, and characters. It features Lua scripting for defining item behaviors without recompilation, spatial partitioning for efficient network updates, and snapshot-based world persistence. The emulator includes an embedded HTTP admin API with a React management interface and compiles to a native binary via NativeAOT. Currently incomplete, it lacks combat and skill systems but provides a solid technical foundation for Ultima Online server development.

written from the facts on this page · September 2026

From the sources

In the maker’s words, at launch

I've been building a modern Ultima Online server emulator from scratch. It's not feature-complete (no combat, no skills yet), but the foundation is solid and I wanted to share it early. What it does today: - Full packet layer for the classic UO client (login, movement, items, mobiles) - Lua scripting for item…

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