5. eBay Kleinanzeigen
Kleinanzeigen on eBay is where you should visit if you are looking to buy or sell used items such as cars.
While it does not offer a website in English, you could appreciate this website as it provides all the necessary information about the vehicles and their owners.
If you want used cars, I suggest Kleinanzeigen on eBay as a backup option after researching AutoScout24.
However, eBay Kleinanzeigen is the best place to buy second-hand goods in Germany.
Other websites you might want to check out: