Commodore Germany developed the High Speed Grafik, a graphics card displaying 512x512i or 512x256 pixels on the internal monitor of a CBM 4xxx/8xxx. A follow up graphics card for the 8296, HRE, was also developed in Braunschweig.
The printers were already mentioned, they also did the MBS system that would let several pets share the same set of peripherals. Additionally some (or all?) of the later CBM 8xxx (8096, 8296, I think, maybe the -SK designs) were done in Braunschweig.
The reason for all this PET centered development is that the PET was pretty successful as a business computer in Germany (allegedly, they had about 20% of the business market in 1982). That's also why they started developing PCs: Commodore USA had decided to concentrate on the consumer market, but Germany needed a follow-up for their aging CBM line.
PCs developed in Braunschweig (there might be more:
- PC-10 II
- PC-20 II
- PC-10 III
- PC-20 III
- PC-30 III
- PC-35 III
- PC-40 III
- PC-45 III
- PC-60 III
- PC-70 III
Th PC-10/20 had a motherboard that consisted of two separate parts. One of the explanations (there are others) I heard for that fact: The design was done on PETs, and the PET didn't have enough memory for designing bigger boards...
Braunschweig also developed the original A2000 design, that was later cost-reduced by Dave Haynie, the sidecar and most (if not all) "Bridgeboards" that contained a mostly complete PC on an Amiga expansion card.
Commodore Germany's chief of engineering Wilfried Rusniok joined Schneider Computer Division in 1988, which then developed the Schneider Euro PC, the most Commodore-like PC ever built ;)
The CBM 900 was not designed in Germany but in West Chester by Commodore's 'Unix Group'.