Prussia/Saxon Maps?

For Saxony, there is for example the Petri map, which was used by all armies in the area in 1813. See https://www.deutsche-digitale-bibliothek.de/item/3L2JNTZCTWYQYZV2BCXQ3HGVNGF27PTA and http://www.ingenieurgeograph.de/Unterrichten/Kriegsschule_1813/Zeilitzheim_2013_12_Kloffler_Petrikarte.pdf

Best wishes, Thomas

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In addition: are there some that show local details such as the extent of villages and forests as the Habsburg maps and the old Bavarian maps do?

Every site I checked referes to the above site, so I don't think these maps are online. It is very difficult to trace public resources in Germany. There are some, but hard to find. Other countries are far more creative commons minded. I think it's the old spirit of Köpernick the can't free themselves from. On Youtube I love the short item's of Reale Irrsinn. As a dutchman it hardly to grasp how completely different things are organised in Germany. But funny. On the other hand I find it very difficult to find good pics to use from german sites. And since my site is in german, it's quite frustrating.

Well, it is not easy, as even today the various online offers are scattered through the federation. Basically printed maps and digitized maps are available at the "Landesvermessungsämter" of the respective federal states (Bundesländer). Maps are also preserved at various libraries and archives, most prominent are the Staatsbibliothek Berlin, Kriegsarchiv Wien, Krigsarkivet Stockholm and Bayerische Staatsbliothek München which maintain separate divisions for maps. The degree of digitization is not very much advanced, but you can order digitized copies.

Online shops or download offers are:

https://www.landkartenshop.de/index.php

https://www.ub.uni-freiburg.de/eucor/karten/karten.html