DnD Charakterbögen ausfüllen ist kompliziert. Das ist als ob
man erst Immigrationspapiere ausfüllen muss bevor man die
Fantasywelt betreten darf. (SK)

Only few people are really willing to implement an own operating system, at least compared to the people willing to implement an own textadventure. But there are projects. Like MikeOS. A nice little OS with an elementary text editor, BASIC interpreter and an implementation of Hang Man.

Nothing special. But nice.