I don't know if I missed it, but did you specify what type of furniture you mean? There are sideboards, wall units, shelves, hanging boards… etc etc… It might not necessarily all have to be from the same manufacturer.
A good source of inspiration is also the exhibitor catalog of the IMM furniture fair. Not super comfortable to browse through, but with many manufacturers. You can also find concentrated information about manufacturers on an Expo page for architects. Furthermore, it is often helpful to look at who is a member of the associations – these associations exist for every industry.
Thank you very much for the further recommendations for inspiration!!!
Ultimately a complete set, which in my case means: lowboard, standing shelf, wall cabinets, wall shelves and desk/cut-to-size board for self-assembly. A highboard is not necessarily required.