Moongate v2 is a modern Ultima Online server built with .NET 10, deterministic game-loop processing, Lua scripting, and a chunk/sector-based spatial world model.

I am actively looking for contributors and reviewers.

• Issues: https://github.com/moongate-community/moongate/issues
• Discussions: https://github.com/moongate-community/moongate/discussions
• Discord: https://discord.gg/h9UUyGqd

• Pull requests run the CI workflow only, to keep feedback fast.
• Coverage, security audit, and third-party notices run on main, with scheduled/manual execution for the heavier audits.
• GitHub releases are mirrored to Discord via the GitHub Release Assets workflow.
• Configure the repository secret DISCORD_CHANGELOG_WEBHOOK_URL to enable changelog posting.
• Release notes are sourced from CHANGELOG.md, include a generated contributors section, and are posted to Discord after the GitHub release is created.
• NuGet packages are published by the NuGet Publish workflow.
• Configure the repository secret NUGET_KEY to enable publishing to nuget.org.
• The NuGet publish flow also ships Moongate.Templates, which provides dotnet new moongate-plugin, and Moongate.TemplateValidator, which provides moongate-template.

• .NET SDK 10.0+
• Ultima Online data files (client)

git clone https://github.com/moongate-community/moongate.git
cd moongate
dotnet run --project src/Moongate.Server -- --root-directory ~/moongate --uo-directory ~/uo

Run this every time you change shard template data under your Moongate root, especially ~/moongate/templates/items, ~/moongate/templates/mobiles, ~/moongate/templates/loot, ~/moongate/templates/factions, ~/moongate/templates/sell_profiles, or ~/moongate/data/containers.

Install the validator tool from nuget.org:

dotnet tool install --global Moongate.TemplateValidator

Run the validator:

moongate-template validate --root-directory ~/moongate

Each validation run prints the validator version and the target root directory before the validation summary.

Update an existing global installation:

dotnet tool update --global Moongate.TemplateValidator

If you are developing inside this repository and want to install from a locally packed artifact instead:

dotnet pack tools/Moongate.TemplateValidator/Moongate.TemplateValidator.csproj -o ./tools/Moongate.TemplateValidator/nupkg
dotnet tool install --tool-path ./artifacts/template-tool --add-source ./tools/Moongate.TemplateValidator/nupkg Moongate.TemplateValidator

Run the local installation:

./artifacts/template-tool/moongate-template validate --root-directory ~/moongate

Published docs: docs/articles/operations/template-validation.md

git clone https://github.com/moongate-community/moongate.git
cd moongate
docker build -t moongate:local .
docker run --rm -it \
  -p 2593:2593 \
  -p 8088:8088 \
  -v "$HOME/moongate:/app/moongate" \
  -v "$HOME/uo:/app/uo" \
  moongate:local

Server port: 2593 UDP ping port: 12000 HTTP/UI API port: 8088

Transport encryption:

• Moongate supports both plain and encrypted UO clients.
• Recommended default: game.encryptionMode = "Both" in moongate.json.
• Operational details and handshake behavior: docs/articles/networking/client-encryption.md

Default credentials: admin / password Change them immediately from the server console with .password.

Player portal routes:

• Dev UI: http://localhost:5173/portal/login
• Embedded UI: http://localhost:8088/portal/login
• Authenticated profile: http://localhost:8088/portal/profile

cd ui
npm install
npm run dev

UI default URL: http://localhost:8088/

• UO TCP server + packet pipeline
• Deterministic single game-loop with separate network inbound/outbound workers
• Source-generated packet/command/listener registration
• Sector/chunk spatial system with lazy warmup and broadcast radius
• Registry-driven snapshot buckets + journal persistence over MemoryPackable runtime entities
• Lua scripting runtime for commands, gumps, item/mobile behavior
• Startup-loaded C# plugins from the runtime plugins/<plugin-id>/ directory
• Classic books rendered from moongate_data/templates/books/*.txt, with support for both read-only content and writable books (0x93 header saves, 0x66 page saves)
• HTTP admin API + OpenAPI for tooling/UI
• Web admin UI (ui/) for item templates and server/admin workflows
• Player portal for authenticated account overview, profile editing, and password change (/portal/login, /portal/profile, /api/portal/me, /api/portal/me/password)

• Spatial model is sector-first (chunk-style), not pure repeated range scans.
• World generation pipeline uses named generators (IWorldGenerator) and command-triggered runs (example: doors).
• Doors support runtime open/close behavior and network updates.
• Persistence uses MemoryPack with registry-driven snapshot buckets and generic journal entries.
• Mobile domain model was refactored to remove Level and Experience from UOMobileEntity (they are not part of the base UO mobile model).

• UI Screen 1: login and initial admin entry point.
• UI Screen 2: authenticated dashboard and main navigation.
• UI Screen 3: item templates search with image previews.

• Character Creator at Docks: character creation flow and initial spawn area.
• Door Open/Close Fix: the bug is still there (damn doors).
• Orion Lua Brain: scripted NPC behavior example (orion.lua) with speech loop (my cat is always hungry and always looking for food).
• Teleport Gump: Lua-driven teleport UI and location workflow.

• Docs home: docs/index.md
• Getting started: docs/articles/getting-started/
• Architecture: docs/articles/architecture/
• Beginner content authoring: docs/articles/scripting/create-your-first-content.md
• Beginner systems path: docs/articles/scripting/create-your-first-systems.md
• Scripting: docs/articles/scripting/ including authored dialogues, quests, public moongates, scheduled events, starting loadout, and loot containers
• Persistence: docs/articles/persistence/
• Networking/protocol: docs/articles/networking/ including client encryption and the UDP ping server
• Operations: docs/articles/operations/ including template validation, in-game item admin commands, and help ticket workflow

Published docs: https://moongate-community.github.io/moongate/

• Benchmarks project: benchmarks/Moongate.Benchmarks
• Cross-map teleport cold-destination benchmark: TeleportMapChangeBenchmark.HandleCrossMapTeleport_ColdDestination
• Same-map teleport cold-destination benchmark with self refresh: TeleportMapChangeBenchmark.HandleSameMapTeleport_ColdDestination_WithSelfRefresh
  • Dry run on Apple M4 Max / .NET 10:
    • cross-map median 2.850 ms, mean 4.284 ms, first cold outlier 19.939 ms, allocated 1.85 MB
    • same-map median 1.947 ms, mean 2.908 ms, first cold outlier 13.514 ms, allocated 1.22 MB
• Intelligent NPC dialogue scheduling benchmark: NpcDialogueSchedulingBenchmark
  • Dry run on Apple M4 Max / .NET 10:
    • queue listener median 2.729 us, mean 183.0 us, first cold outlier 2.133 ms, allocated 592 B
    • schedule and complete median 1.170 ms, mean 1.258 ms, first cold outlier 2.169 ms, allocated 1552 B
    • reject duplicate in-flight median 1.270 ms, mean 1.073 ms, first cold outlier 2.696 ms, allocated 1288 B
• Black-box socket stress tool: tools/Moongate.Stress
• Guide: docs/articles/operations/stress-test.md
• Packet handler performance guide: docs/articles/networking/packet-handler-performance.md

Moongate v2 is inspired by the UO emulator ecosystem.

Special thanks:

• POLServer: https://github.com/polserver/polserver
• ModernUO: https://github.com/modernuo/modernuo

Data imported/adapted from ModernUO distribution is used in selected world datasets (decoration, locations, signs).

Contributions are welcome. Please open an issue/discussion first for non-trivial changes.

• Follow CODE_CONVENTION.md
• Keep tests green
• Keep docs aligned with runtime behavior

GPL-3.0. See LICENSE.