To control your MCC cars the following programs are available.
iCar as part of iTrain using payed licences can control MCC Carsystem. It is also possible to combine cars and trains so the whole layout can be controlled using one program. This software can be used on different operating systems, e.g. Windows and Apple.
Koploper is freeware supporting a lot of possibilities to control cars as well as trains on your layout. The software is only available in the Dutch language and runs on Windows operating system. There is no development anymore on this software.
Rocrail is open-source software for model layouts. The software is able to interface several digital systems, it supports several languages and runs on different operating systems (e.g. Windows and Linux).