Rage:MP is a multiplayer modification framework for Grand Theft Auto V, allowing custom online servers with open-world and RPG elements. While it is not a standalone MMO, it still maintains a significant niche player base due to persistent custom servers, roleplay communities, and modding communities. As of 2024, its daily active players are estimated around 20,000, largely concentrated in popular servers, but it is not officially an MMO as each server is a separate world.