Since the early days of EWM it has had a German section which has organised a number of national and international meetings. The section also maintains an email distribution list (ewm-info) for Germany with information on job ads and other matters. The German Mathematical Society (DMV) has Diversity and Equal Opportunities as one of its fields of activities and cooperates closely with the German section of EWM in this context. The Emmy Noether Lectures were initiated by the Diversity and Equal Opportunities representative in 2008. The Arbeitskreis Frauen und Mathematik is a sub-unit of the Gesellschaft für Didaktik der Mathematik (= German society of math education) (GDM) and is mainly concerned with math education and history of mathematics. A more detailed report written in 2011 can be found here.
Here is an interactive map on which you can locate female mathematics professors in Germany.