MIT/GNU Scheme

MIT/GNU Scheme is a programming language, a dialect and implementation of the language Scheme, which is a type of Lisp. It can produce native binary files for the x86 (IA-32, x86-64) processor architecture. It supports the standard R7RS mostly. It is free and open-source software released under a GNU General Public License (GPL). It was first released by the developers at the Massachusetts Institute of Technology (MIT), in 1986, as free software even before the Free Software Foundation, GNU, and the GPL existed. It is now part of the GNU Project.
It features a rich runtime software library, a powerful source code level debugger, a native code compiler and a built-in Emacs-like editor named Edwin.
The books "Structure and Interpretation of Computer Programs" and "Structure and Interpretation of Classical Mechanics" include software that can be run on MIT/GNU Scheme.
Edwin.
Edwin is a built-in Emacs-like editor that comes with MIT/GNU Scheme. Edwin normally displays the codice_1 data buffer, the mode line, and the mini-buffer when it starts. As in Emacs, the mode line gives information like the name of the buffer above it and whether that buffer is read-only, modified, or unmodified.