Moongate – Ultima Online server emulator in .NET 10 with Lua scripting
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 behaviors (double-click a potion, open a door — all defined in Lua, no C# recompile) - Spatial world partitioned into sectors with delta sync (only sends packets for new sectors when crossing boundaries) - Snapshot-based persistence with MessagePack - Source generators for automatic DI…
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 behaviors (double-click a potion, open a door — all defined in Lua, no C# recompile) - Spatial world partitioned into sectors with delta sync (only sends packets for new sectors when crossing boundaries) - Snapshot-based persistence with MessagePack - Source generators for automatic DI wiring, packet handler registration, and Lua module exposure - NativeAOT support — the server compiles to a single native binary - Embedded HTTP admin API + React management UI - Auto-generated doors from map statics (same algorithm as ModernUO/RunUO) Tech stack: .NET 10, NativeAOT, NLua, MessagePack, DryIoc, Kestrel What's missing: Combat, skills, weather integration, NPC AI. This is still early — the focus so far has been on getting the architecture right so adding those systems doesn't require rewiring everything. Why not just use ModernUO/RunUO? Those are mature and battle-tested. I started this because I wanted to rethink the architecture from scratch: strict network/domain separation, event-driven game loop, no inheritance-heavy item hierarchies, and Lua for rapid iteration on game logic without recompiling. GitHub: https://github.com/moongate-community/moongatev2
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