CitizenFX

CitizenFX is a multiplayer framework for Rockstar Games' popular video game; Grand Theft Auto IV. This modification introduces a third party multiplayer client that uses the original Net Code from the base game and extends upon it. Servers can host custom made game modes and modifications. With this, the CitizenFX:MP system allows players to make Grand Theft Auto IV something of their own. CitizenFX was eventually adapted to Grand Theft Auto V under the name FiveM.