In the French Alps, there are many refuges which are free to use: you can turn up in most places with no reservation and stay the night.
I can't seem to find any mention of these free refuges in Germany (specifically the Black Forest). Do they exist in the Black Forest and, if so, are they available to use in the same way?
To go into more detail about what I mean by a refuge, the Refuges des Aubarets is a good example. I understand that they are primarily used to offer shelter to people in tough conditions, but are commonly used by hikers to spend the night. They are also known as cabane non gardée (unguarded/not looked after cabin).