Deutsche Boerse AG - Includes information, market data, DAX index, Xetra trading platform, listed companies, news, and the Frankfurt Stock Exchange.
German-taxation.com - General information about German taxes and social security withholdings. Calculate your own income tax and social security contributions.
Wolfgang Steubing AG - Broker in Frankfurt/Main provides information about business activities, like trading, selling, research and IPO-service, and company history.