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Highly Performant & Scalable Ultima Online Server Emulator https://www.modernuo.com
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Kamron Batman 861c7e5f4d refactor(factions): migrate Faction/Town from RunUO Parse(string) to ISpanParsable<T> 
Faction and Town were never converted from RunUO's bare static Parse(string) to
IParsable/ISpanParsable, so they had only a 1-arg Parse(string) that returned null on
no-match. That made them unreachable through Server.Types' IParsable path (they fell to
Convert.ChangeType and failed) and, worse, would have let [set assign null silently on a
bad name. Both now implement ISpanParsable<T> (string + span Parse/TryParse, throw-on-
failure contract), matching Race/Poison. No external callers depended on the old
null-returning Parse.

Also documents the convention in dev-docs/runuo-migration-docs/01-foundation-changes.md
(new section 15 + checklist item): ModernUO expects any RunUO static Parse(string) to be
converted to IParsable<T>/ISpanParsable<T>. Server.Types still binds a legacy Parse(string)
by reflection as a safety net. Full suite 535/535.
2026-07-20 09:29:22 -07:00
.config feat: Adds Build Tool for Publishing/Setup (#2392) 2026-03-28 21:21:50 -07:00
.github ci: cap job runtime, dump on test hangs, expand the Linux matrix (#2538) 2026-07-16 22:37:06 -07:00
branding feat(build-tool): add application icon and refresh MUO.ico (#2487) 2026-06-14 11:59:54 -07:00
dev-docs refactor(factions): migrate Faction/Town from RunUO Parse(string) to ISpanParsable<T> 2026-07-20 09:29:22 -07:00
Distribution/Data fix(throwing): grant Str/Dex stat gains for the Throwing skill (#2514) 2026-07-02 23:07:36 -07:00
Projects refactor(factions): migrate Faction/Town from RunUO Parse(string) to ISpanParsable<T> 2026-07-20 09:29:22 -07:00
.cursorrules chore: Adds AI instructions and SKILLs for ModernUO codebase (#2347) 2026-03-01 11:42:19 -08:00
.editorconfig chore(docs): Adds UnmanagedDataReader & BinaryFileReader documentation (#1968) 2024-10-01 17:07:51 -07:00
.gitattributes fix: Adds migration checks to CICD, updates dependencies, adds Fedora 37, alpine 3.17 support (#1309) 2022-12-22 12:12:47 -08:00
.gitignore feat: Adds Build Tool for Publishing/Setup (#2392) 2026-03-28 21:21:50 -07:00
AGENTS.md chore: Adds AI instructions and SKILLs for ModernUO codebase (#2347) 2026-03-01 11:42:19 -08:00
azure-pipelines.yml chore: Cleans workflows for NodeJS 24 (#2394) 2026-03-28 21:55:29 -07:00
CLAUDE.md feat(pathfinding): first-boot prompt to pre-bake the .swb map cache (#2475) 2026-06-07 16:30:33 -07:00
CODE_OF_CONDUCT.md Create CODE_OF_CONDUCT.md 2020-05-05 08:51:39 -07:00
CONTRIBUTING.md chore(license): Removes CLA requirement. All contributors moving forward will retain copyright. (#2038) 2024-12-31 02:52:58 -08:00
Directory.Build.props fix: Bumps dependencies. (#2531) 2026-07-14 15:17:55 -07:00
FAQ.md docs: Updates FAQ for time zone issues. (#1368) 2023-03-10 00:18:36 -08:00
GEMINI.md chore: Adds AI instructions and SKILLs for ModernUO codebase (#2347) 2026-03-01 11:42:19 -08:00
global.json feat: Adds Build Tool for Publishing/Setup (#2392) 2026-03-28 21:21:50 -07:00
LICENSE Fixes more line ending issues (#267) 2020-09-27 13:54:56 -07:00
ModernUO.slnx feat: Adds Build Tool for Publishing/Setup (#2392) 2026-03-28 21:21:50 -07:00
publish.cmd feat: Adds Build Tool for Publishing/Setup (#2392) 2026-03-28 21:21:50 -07:00
publish.ps1 fix: Adds stamp check for build tool versioning (#2400) 2026-04-06 16:18:02 -06:00
publish.sh fix: Adds stamp check for build tool versioning (#2400) 2026-04-06 16:18:02 -06:00
README.md ci: cap job runtime, dump on test hangs, expand the Linux matrix (#2538) 2026-07-16 22:37:06 -07:00
rider-settings.zip Cleanup/Housekeeping (#242) 2020-09-12 15:31:21 -07:00
Rules.ruleset chore(docs): Adds UnmanagedDataReader & BinaryFileReader documentation (#1968) 2024-10-01 17:07:51 -07:00
SPONSORS.md chore: Updates readme files (#2247) 2025-07-27 11:04:32 -07:00
stylecop.json Updates formatting rules (#199) 2020-08-25 18:00:51 -07:00
THIRD-PARTY-NOTICES docs: Adds RunUO-Encryption notice attribution to DarkStorm (#2369) 2026-03-12 23:35:47 -07:00
version.json feat: Adds Build Tool for Publishing/Setup (#2392) 2026-03-28 21:21:50 -07:00

README.md

ModernUO - Ultima Online Server Emulator for the modern era!

ModernUO Discord Subreddit subscribers Twitter Follow

Ultima Online Server Emulator for the modern era!

GitHub license GitHub stars GitHub issues
GitHub build Azure Pipelines build

Requirements

Supported Operating Systems

Windows 10/11/2012/2016/2019/2022/2025 MacOS 14+ Debian 12+ Ubuntu 22+ LTS
Alpine 3.22+ Fedora 42+ RedHat 9+ CentOS Stream 9+ AlmaLinux 10 openSUSE 15.6+ SUSE Enterprise 15 SP6 Linux Mint 21+ Arch

Required Frameworks

All Operating Systems

.NET

Windows

VC++ Redistributable v14

Development

git .NET

Supported IDEs

Jetbrains Rider 2025.3+ space VSCode space Visual Studio 2026

Getting Started

  • Install prerequisite requirements
  • Clone this repository (or download the latest):
    • git clone https://github.com/modernuo/ModernUO.git
  • Open ModernUO.sln to start developing

Building/Publishing

Interactive Mode (Recommended for new users)

Run ./publish.cmd (Windows) or ./publish.sh (Linux/macOS) with no arguments to launch the guided build tool. It will:

  • Check prerequisites (.NET SDK, native libraries)
  • Walk you through configuration and platform selection
  • Build and publish the server to the Distribution directory
  • Show deployment instructions for cross-compiled builds

Command Line

./publish.cmd [release|debug] [os] [arch]

Linux Prerequisites

Fedora, CentOS, RHEL, AlmaLinux, Rocky, etc

dnf upgrade --refresh -y
# RHEL-family distributions (CentOS Stream, AlmaLinux, Rocky, RHEL) need CRB and EPEL enabled.
# Fedora skips this block.
dnf install -y dnf-plugins-core
dnf config-manager --set-enabled crb
dnf install -y epel-release
# Prerequisites
dnf install -y findutils libicu libdeflate-devel zstd libargon2-devel liburing-devel

Ubuntu, Debian, etc

apt-get update -y
apt-get install -y libicu-dev libdeflate-dev zstd libargon2-dev liburing-dev

OSX Requirements

brew install icu4c libdeflate zstd argon2

Running the Server

  • Follow the publish instructions
  • The Distribution directory is portable — copy it to your production server for deployment
  • Run ModernUO.exe or dotnet ModernUO.dll from the Distribution directory
  • On first run, the server will prompt you to configure game data file locations

Troubleshooting / FAQ

Want to sponsor?

Thank you for supporting us! You can find out how by visiting the sponsors page.

Collaborators

Kamron Batman Mark1145

Thanks

  • RunUO Team & Community
  • Voxpire, the ServUO Team & Community
  • Karasho, Jaedan and the ClassicUO Community



Development Tools & Plugins provided with ♥ by

JetBrains
Material Theme

Code Signing Policy

Free code signing provided by SignPath.io, certificate by SignPath Foundation.

This program will not transfer any information to other networked systems unless specifically requested by the user or the person installing or operating it

Teams & Roles

Approvers & Committers: Development Team