Leonardo

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 Freeware C development environment for the Macintosh

 Authors:  Camil Demetrescu and Irene Finocchi
 Homepage: http://www.dis.uniroma1.it/~demetres/Leonardo/
 Family:   IDEFamily MacintoshEditorFamily
 Platform: Apple MAcintosh
 License:  Freeware

a text editor with syntax coloring
a compiler for the ANSI C language
a compiler for the ALPHA visualization language
a reversible virtual CPU
a basic operating system for process, I/O and memory management
an integrated logic-based visualization system
a simple graph editor

Main features:

It allows you to edit, compile and execute arbitrary C programs on the virtual CPU.
No size limits are imposed on C programs.
It's a multitasking environment.
Programs can be executed both forward and backward: it is possible to reverse the execution of a program at any time by means of a control tool window

All available standard ANSI C library functions (including fprintf, fscanf, malloc and free) are fully reversible. The more space you have on your working secondary memory, the more program instructions you can reverse.
Programs can be animated by embedding in the C source special declarations written in a simple logic-based programming language called ALPHA. For example, if you want a window to appear on the screen you have simply to declare it by means of the "View" ALPHA predicate. In the same way you may want a rectangle to appear in your window: just declare it with "Rectangle".

Note: no longer developed. Superseded by the Leonardo Computing Environment.

 Screenshot: