TrinityCore is an MMORPG framework that's built using C++, and using a back-end of MySQL for the DB content. Trinity was at one point a merger of MaNGOS with many patches submitted by users, that is no longer the case. Trinity is an individual project with a diverse development team.
If you have any problems and the search did not give the proper result, use the section Support, there you can ask a question that you will definitely get an answer to! Use the prefix TrinityCore