was developed by Donald Knuth.
It is available free of charge, from a number of sites.
The National Research Council runs and 
on the
IBM mainframe, Sun workstations, Silicon Graphics workstations
and servers, and PC's.
is a collection of macros, much easier to use
than itself.
This document was completely written in .
Sli and BiB are two utilities available on both
the mainframe, and UNIX.
The first one produces slides for overhead projectors, and the
second one produces a bibliography (it was also used in
this document).
The UNIX version of contains other utilities such as