CoXServer is a development project aimed at creating a game server emulator for the game Dark Age of Camelot.
The server will be written in C++ and will use a XML backend by default with MSSQL, MySQL and Oracle support in the future.
What is RevoCP? It is a Management Website for MaNGOS and TrinityCore2 that will help with simple tasks. It does not Create a Game server, it makes it so that people can have a Website without having to build one from scratch.