Luxury and High-Performance Brands:
* Audi: A4, A5, A6, A7, A8, Q5, Q7, R8
* BMW: 3 Series, 5 Series, 7 Series, X3, X5, X6, i3, i8
* Mercedes-Benz: C-Class, E-Class, S-Class, GLC, GLE, GLS, AMG models
* Porsche: 911, Boxster, Cayman, Panamera, Cayenne
Mainstream and Budget Brands:
* Volkswagen: Golf, Passat, Polo, Tiguan, Touareg, ID.3, ID.4
* Opel/Vauxhall: Astra, Corsa, Insignia, Mokka, Grandland X
* Ford (Germany): Fiesta, Focus, Mondeo, Kuga (these are built in Germany, but the Ford brand is American)
* Smart: Fortwo, Forfour (owned by Mercedes-Benz)
Other Notable German Brands:
* Maybach: Luxury sub-brand of Mercedes-Benz
* Brabham: A new sports car manufacturer reviving the historic Brabham Formula One name
* Borgward: A revived brand with a focus on SUVs
* Gumpert: A manufacturer of high-performance sports cars
Important Note: This is not an exhaustive list. Many smaller German car manufacturers also exist, and the list above is just a selection of some of the most well-known brands.
Do you have a particular type of car or brand in mind? I can give you more specific information about particular models or manufacturers.