Contributing to development

Hey
Is Nostalrius based on TrinityCore? If so, do you still pull in changes from their public repository as bugs get fixed? Just want to know if it's possible to contribute to the development of Nost.
Is Nostalrius based on TrinityCore? If so, do you still pull in changes from their public repository as bugs get fixed? Just want to know if it's possible to contribute to the development of Nost.