There is Pharo: http://www.pharo-project.org/ http://www.pharo-project.org/ But it is more an IDE, not a general UI for work like Emacs. (But it could for sure

There is Pharo: http://www.pharo-project.org/ http://www.pharo-project.org/ But it is more an IDE, not a general UI for work like Emacs. (But it could for sure be turned into one)