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Old School Ops presents

GoMMO

Framework

The MMORPGs we grew up on, back online. Every server here is written from scratch on one Go framework and speaks the original client byte for byte. Run your own world, mod it with GoMMO Studio, or play on ours once our servers are back up.

Choose your world Run your own server What is GoMMO
Select world11 worlds
Gate to Heavens
Gate to Heavens Modern Primary v0.3.1 Gate to Heavens Classic Primary v0.3.1
RF Online
RF Online: Dragonborn Primary v0.1.2 RF Online: Age of Patron Maintained v0.1.0 RF Online 1.5 Primary v0.2.3 RF Online: Golden Age Primary v0.6.0 RF Online: Secret of Holystone Maintained v0.1.6 RF Online: Red Army Maintained v0.1.9 RF Online: Giga 4 Part 2 Maintained v0.3.9
World of Kung Fu
World of Kung Fu Alpha v0.2.0
DragonSoul
DragonSoul Alpha unreleased
No public servers while we rebuild our hosting. Every world ships as a bundle you can run. Downloads
Now showing Gate to Heavens · Liberty Heaven
[Notice]RF Online 1.5 v0.2.3 released 3 Oct 2026[Notice]RF Online: Dragonborn v0.1.2 released 3 Oct 2026[Notice]Gate to Heavens Classic v0.3.1 released 2 Oct 2026[Notice]GoMMO Client v0.1.3 released 2 Oct 2026[Notice]RF Online 1.5 v0.2.2 released 2 Oct 2026[Notice]RF Online 1.5 v0.2.1 released 1 Oct 2026[Notice]RF Online: Dragonborn v0.1.1 released 1 Oct 2026[Notice]Gate to Heavens Classic v0.3.0 released 30 Sep 2026
The worlds

4 families. One engine room.

Each family is one original game, and each version of it is its own server, because the client changed between them.

The framework

What every world is built from

A fix to the core reaches every game, and a game added later starts with all of it in place. Game logic, opcodes and content stay with each game.

Shared Accounts

Core packagepkg/account · pkg/auth
  • One accounts database shared by every game on a server
  • Email login, argon2id password hashing
  • Staff levels granted per game; a ban blocks the account everywhere
  • Gate to Heavens and RF servers can sign players in with their oldschoolops.com account
"Made once. Used in every world."

SQLite and MySQL

Core packagepkg/database
  • SQLite by default, nothing to install
  • MySQL for production
  • One schema; the SQLite form is derived from it at run time
  • A server creates a missing or empty database on first start
"Unzip, run, and the tables are there."

Protocol Layer

Per familygames/*wire
  • Packet framing, ciphers and codecs, one package per game family
  • Opcodes and struct layouts live with each game
  • Every message matches the original client byte for byte
"Never trust a version number."

Build Isolation

Build ruleverify-split
  • Each game binary holds no code from another game
  • One gameserver process per game, serving all its worlds
  • Windows and Linux x64
"What one world breaks stays in that world."

Lua Scripting

Scriptingpkg/script
  • A sandboxed Lua host with instruction and time budgets
  • A verb set per family: RF dungeons, Gate to Heavens NPC conversations
  • Content is .lua files in the server folder, changed without recompiling
"Write a script, not a patch."

Two-Layer Testing

Testingtest · soak
  • Rule tests, each on its own in-memory server
  • A live-world soak under a crowd of bots
  • Both must pass before any release
"Nothing ships that the bots could break."
Activity

What happened in the world

Releases, forum threads and bug reports in one channel, the way a game's chat window shows everything at once.

World chatFull history

[2d ago] [Bug] OSO AI replied: Monsters only start spawning when you get close to them · RF15-118

[2d ago] [Bug] OSO AI replied: EXP Is Not Capped by Level Difference · RF15-120

[2d ago] [Bug] OSO AI replied: Cannot Purchase Care Stamina Potion 800 · RF15-121

[2d ago] [Bug] OSO AI replied: Skill Stretch not working · RF15-127

[2d ago] [Bug] OSO AI replied: Error on MAU Repairing · RF15-130

[2d ago] [Bug] OSO AI replied: Max lvl by %lv · RF15-128

[2d ago] [Bug] OSO AI replied: The Individual Enchant icon doesn’t work · RF15-109

[2d ago] [Bug] OSO AI replied: Item Gain Announcements and Kill Count System Not Working · RF15-125

[2d ago] [Bug] OSO AI moved it to Released: RF 4.55: 03/1F other\_shape\_all\_zocl is 8 bytes shorter than the client reads · RF455-029

[2d ago] [Bug] OSO AI moved it to Released: rf455 v0.1.1 - 12 class skills are disabled placeholders on the server (Counter Attack, Guard Break, Bull's Eye, Snipe) · RF455-030

[2d ago] [Bug] OSO AI moved it to Released: RF 4.55: the server gives out quests whose steps need quest items it doesn't have; the client then dies at every login (Q004050) · RF455-031

[1d ago] [Release] RF Online: Dragonborn 0.1.2

[1d ago] [Release] RF Online 1.5 0.2.3

[1d ago] [Bug] OSO AI replied: Client crashes in 49 seconds · RF15-131

[1d ago] [Bug] Dokazin replied: Cheating Card System doesn't seem to be working properly · RF15-117

[1d ago] [Bug] OSO AI moved it to Fixed: Teleport and MAU · RF455-032

[1d ago] [Bug] Dokazin replied: Trigger / Combo / Burst Skills Not Working · RF15-124

[1d ago] [Bug] Dokazin replied: Monsters Missing Effects, Glows and Particles · RF15-126

[1d ago] [Bug] OSO AI moved it to Response Required: Screen Feature · ART-001

[1d ago] [Bug] OSO AI moved it to Fixed: Siege kits with low durability · RF15-135

[1d ago] [Bug] OSO AI moved it to Fixed: Accretia doesnt have a way to increase FP · RF15-134

[1d ago] [Bug] OSO AI moved it to Fixed: Animus Issues · RF15-133

[1d ago] [Bug] OSO AI moved it to Fixed: Can't use items while you're on unit · RF15-132

[17h ago] [Bug] OSO AI moved it to Fixed: Potion buff have no effect · RF455-033

[11h ago] [Bug] OSO AI replied: Set and jewelry items lack set bonuses. · RF2232-487

[3h ago] [Thread] Ron started it: A New Look & GoMMO Studio · News

[2h ago] [Bug] OSO AI moved it to Fixed: Unknown NPC · RF455-034

Sign in to post on the forum and report bugs. Forum
Latest dropsChangelog
Game releaseTool releaseRelease candidate
Who is here
Members47
Active this week42
Posts184
Bug reports46
Tools

GoMMO Studio

Open a game client and edit its world. Maps, models, spells and textures for every game on the framework, in one window, with an Install step that writes the client and server files and keeps backups.

  • Map editor with walk grids, spawns, lighting and a problems list
  • Model viewer that dresses characters in real items and plays every animation
  • Texture recolour, packs, and screenshots or turntable GIFs at 1080p
  • Works on Gate to Heavens, RF Online and World of Kung Fu clients
Get GoMMO Studio
GoMMO Studio editing the Bellato map from RF Online: Golden Age
Self-host

Run your own world

A release bundle has the server, its data and a fresh database. Nothing else to install.

  1. Download a release

    Pick a game and a version from Downloads.

  2. Unzip it anywhere

    SQLite is the default, so the databases build themselves on first start. Switch to MySQL when you need it.

  3. Run the server

    One process serves every world for that game. Point the client at it and log in.

DownloadsInstalling guide
gameserver.exeexample start-up
> gameserver.exe
settings.cfg found in .\
database sqlite (default)
gommo_accounts provisioned
game database provisioned
game data loaded
listening on the game port
ready. waiting for players
Press start

One account. Run it, mod it, play it.

Your Old School Ops account covers everything here: the downloads, the docs, the forum and bug reports today, and logging in to our game servers once they are back up.

Operate

Download a server bundle for any game, read the setup docs, and report what breaks so the fix lands for everyone.

Mod

Edit maps, models, spawns and textures in GoMMO Studio, then install the changes into your own client and server.

Play

Log in to our public servers with the same account when they return, and follow every release on the forum until then.

Create an account Get a server bundle
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