open.mp: Open Multiplayer, a multiplayer mod fully backwards compatible with SA-MP

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open.mp is the modern successor to SA-MP, fully backwards compatible with existing SA-MP scripts and servers. If you grew up on SA-MP and want the same world with active maintenance and modern tooling, this is the project carrying that torch.

What is open.mp?
Open Multiplayer, a multiplayer mod fully backwards compatible with SA-MP

SDK/include Core SDK headers (stable between versions) SDK/include/Server/Components// Components/plug-in SDK headers (stable between versions) Shared/NetCode/ Netcode headers (RPC and packet read/write structures, NOT stable between versions) Shared/Network/ Network utility headers (NOT stable between versions) lib/ Various submodules and third-party libraries Server/Source/ Core server implementation (NOT stable between versions, do NOT use headers outside the Source folder) Server/Components// Components/plug-in implementation (NOT stable between versions, do NOT use headers outside the component's folder) Entity Something that can appear in the 3D world of the game Pool Container of something with limited amount of IDs Component Something that's conceptually different enough it can be separated into its own module Extensible Something to which extensions can be added to preserve ABI compatibility Extension Something which adds additional functionality to an extensible and preserves ABI compatibility Conan 2.x (Install it using pip install conan or pip3 install conan) Visual Studio needs the Desktop development with C++ workload with the C++ Clang tools for Windows c.

The facts, straight from GitHub

• Repository: openmultiplayer/open.mp
  
• 622 stars and 197 forks, with 137 open issues
  
• Written mainly in C++
  
• Licensed under MPL-2.0
  
• Started in 2021, last updated 2026-07-01
  

Getting started
Grab it with: git clone https://github.com/openmultiplayer/open.mp.git
You will need a C++ toolchain (Visual Studio on Windows or gcc/clang elsewhere) plus CMake if the project uses it. Check the README for exact build steps.

Frequently asked questions

Is open.mp free to use?
It is released under the MPL-2.0 license, so it is free to use. Read the license text for the exact terms before you ship anything based on it.

Is the project still maintained?
Yes, the last update was pushed on 2026-07-01, so the project is alive and moving.

What do I need to know before diving in?
The project is written mainly in C++, so some familiarity there helps a lot. Start with the README, then browse the open issues to see what the rough edges are. That is usually the fastest way to understand the real state of any repository.

Where do I get help if I am stuck?
Open an issue on the GitHub issue tracker, check existing discussions, and of course post right here in this topic. Someone in the GTA community has probably hit the same wall before you.

Over to you
Have you tried open.mp? Are you running it, forking it, or did you rage quit halfway through the setup? Reply below with your experience, your questions or your own favorite alternative. If there is enough interest we can put together a community guide for it.