Important Applications Developed On ITS
The EMACS ("Editor MACroS") editor was originally written on ITS; in its ITS instantiation, it was a collection of TECO programs (called "macros"). For later operating systems it was written in the common language of those systems. For example, the C language under Unix, and Zetalisp under the Lisp Machine system.
The GNU info help system was originally an EMACS subsystem, and then was later written as a complete standalone system for Unix-like machines.
Several important programming languages and systems were developed on ITS, including MacLisp (the precursor of Zetalisp and Common Lisp), Microplanner (implemented in MacLisp), MDL (which became the basis of Infocom's programming environment), and Scheme.
Among other significant and influential software subsystems which were developed on ITS, the Macsyma symbolic algebra system is probably the most important. Terry Winograd's pioneering SHRDLU program was also developed in ITS. The game Zork was also originally written on ITS.
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