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Datev-products for entrepreneurs
www.datev.de/portal/ShowPage.do?pid=dpi&nid=57749

Form-management-systems of the ministry of finance
www.formulare-bfinv.de

Businessregister
www.unternehmensregister.de

Federal Central Tax Office
Free check of VAT-ID-numbers
https://evatr.bff-online.de/eVatR

Rent-index for Munich
www.mietspiegel-muenchen.de