From mangos

The MaNGOS project is a full featured World of Warcraft server suite, including servers for authentication, client updates, world content serving, and battlegrounds. Additional features include tools to build and develop game content.
MaNGOS is an educational project. This means, our primary interest is to learn and teach us and our users more about C++ project development in a large scale. Our software is not intended for running public servers, and we do not support that.