MrEd

MrEd is a graphical implementation of the Scheme programming language for Windows 95/98/NT, MacOS, and Unix/X. GUI applications written using MrEd run on all supported platforms without modification.

MzScheme is the core Scheme implementation embedded in MrEd.
DrScheme is the graphical environment for developing MrEd programs.

New! DrScheme 100alpha4 is now available for testing.

MrEd is R4RS-compliant (including the full numerical tower) and nearly R5RS-compliant (some macro support is lacking). MrEd provides everything that MzScheme provides, plus:

A windowing toolbox for creating windows and menus
A drawing toolbox for drawing to windows, bitmaps, and printer devices
An editor toolbox for creating multimedia editors

MrEd's GUI toolbox is integrated with MzScheme's thread system. MrEd dispatches events via synchronous (single-threaded) callback procedures, but also supports multiple eventspaces, which permit asynchronous (multi-threaded) event handling among different sets of windows.

MrEd is not yet available for BeOS or in x86 kernel form.

System requirements: Windows 95/98/NT, MacOS, or Unix running the X Window System. MrEd is useful given at least 12 MB of RAM.

Download size is from 1.6 to 2.0 Mb, depending on platform. Disk usage is approximately 8 Mb.

PLT / scheme@cs.rice.edu