Documentation on MTConnect® can be found on the MTCup site (MTConnect User Portal).
Technical documentation surrounding MTConnect® can be found on the MTConnect® Model Browser generated from the SysML model.
Projects are documented by their maintainers and contributors. See individual projects for their detailed documentation.
Anyone looking to help is welcome to. If you're looking for open items, take a look at the Issues board or the Project board.
Additionally, contributors are invited to join the MTConnect Standards Committee and participate in the frequent MTConnect Validation Working Group where we discuss work relavent to tools like the MtconnectCore project.