Computer Science major at RIT and Emacs user. 
Welcome to the wiki!
It seems to me that Zile is not really extensible and therefore an ErsatzEmacs. Do you agree? – AlexSchroeder
Ah, good point… “Zile Lisp” does seem more like a glorified rc file than a real language. As it’s an FSF product I’m surprised they don’t refer to it as an ersatz Emacs per RMS’s definition.
– FranRogers