For those who type on German keyboards or in German, there are a number of layouts that have evolved around the Neo 2 layout [1]. The main driving force is ergonomics, but since not everyone works the same way, many variants have emerged (and still do) [2]. Interesting is the craftsmanship, including customized programs to optimize the layouts [3].
[1] https://www.neo-layout.org/Layouts/
[2] https://maximilian-schillinger.de/keyboard-layouts-neo-adnw-...