This is the input data of the manual for Zettelstore, a software that implements a zettelkasten (aka Luhmann's slip-box).
Most content is written in a markup language called Zettelmarkup. It is rendered on https://zettelstore.de/manual/ (an example of a running zettelstore).
This work is licensed under a European Union Public Licence (EUPL-1.2-or-later).