It might not be a powerhouse but it's fairly stable/good. There's at least one major player (SAP) there's plenty of companies in future fields (Metaio for AR for example) and there's a lot of in house stuff. There's also sort of an "alternative OS" tradition (Suse, yellowTAB). There's also more of a focus on business software (SAP influence might shine through) imo (the difference between Wirtschaftsinformatik and Information Systems has been discussed at length in journals)

Berlin is one of the better non-SV startup locations from what I hear.