http://www.stellwerk-software.de/en/
Quote from their website:
Very easy to use but powerful PC control with Model Railway Digital Systems of companies Massoth DiMAX, LGB MTS II / III (using LGB Central Units and 55060/55045 Interfaces) Lenz (also with LGB locomotives), Uhlenbrock Intellibox (IB1 and IB IR), Fleischmann Twin-Center), Tams EasyControl / RedBox, Arnold or Märklin.
Maintenance and further development of all my programs has been closed at 28th of September 2021 because of age .