Any good calculus texts in German?

Walter has also written very nice texts. Another standard book for lectures is Königsberger. Heuser is very expansive, but once was also a standard.

In my opinion, Foster is a very good reference book for Analysis, short, to the point. But hardly suited for self study.

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If you want a good ( very abstract) introduction in analysis, I would suggest Herbert Amann, Joachim Escher : Analysis I .

This is the textbook we used in our introductory course for Analysis at TU Ilmenau. It is very well written, but also very abstract. It certainly won't be easy to understand on the first try, but the authors have a very nice style in my opinion.

I have always liked Bröcker's Analysis in three volumes (I-III) very much. It is however possibly a bit too condensed as an only text if you are learning the material for the first time.

The books have been out of print for some time now, but they can be bought used. Until recently PDF's were available on his page at the University of Regensburg, but sadly Prof. Bröcker has passed away since this question was asked.