Doehler & Haass and MTTM (Modelrailway Technic Team Munich), are two cooperating manufacturers for digital components.

VELMO decoders use the ASIC and the software of the DH10C decoders of  Doehler & Haass.

Rautenhaus Digital is the company Modellbahntechnik Gerhard Rautenhaus** in Syke, Germany.
A complete range products to get a SelecTRIX* system is available here.

Great, the locos and wagons of SMZ. They created a lot of new variants by reprinting the locos and wagons.
The Highlight of all are their own developed locomotives and trains

The all including homepage for Z-gauge is Jens Wimmels’ ZettZeit. Here you can find nearly everybody and everything around the Z-gauge, own products, many ideas and so much more...

Allways a great experience:
The meetings of the menbers of the Märklin Insider Stammtisch, also called  MIST55 near Mainz.

Here you can find many Z-Friends dicussing about everything, many pictures and ideas: Z-Friends-Europe and Z-Friends-International.