There are a lot of good shell systems out there. I first used SDF. Then circumlunar.space (which is still a mainstay for me). I also now run a micro-pubnix off of a raspberry pi zero (featuring a custom built shell and software suite for gopher phlogging, chat, bbs, and gaming) at gopher://colorfield.space:70/

I do not know much about freeshell.de, but can say that I have found the type of internet community that I have missed since the early 90s ont hese shells.

The tilde crew is really awesome as well.