JEmacs - the Java/Scheme-based Emacs

Currently, JEmacs a functional but very minimal editor. Many of the core Emacs concepts (keymaps, windows, frames, buffers, markers) are implemented, and generally in such a way as to provide the standard Emacs semantics. There are Scheme functions with the same name and similar behavior as the standard Emacs Lisp functions. However, there is only a very limited set of core "editing" commands, and no searching commands. And it is not robust or reliable.