BASF , Bayer and AGFA are all companies that were spun off from IG Farben who made the Zykklon B Gift Gas for Auschwitz.
I am well aware that Bayer no longer holds the patent on Aspirin, I said they invented it, but they still sell Bayer Aspirin
Other well known German companies are SAP (A software company) and Siemens (A multinational copration that makes lots of stuff)
The Euro is essential a German Currency as its basically controlled by Germany (and to an extent France)
And finally you might as well boycott IBM as well since they made the Punch cards that helped automate the mass executions