TeX is a platform-independent typesetting language developed by Professor Donald Knuth.
Although TeX is especially useful for mathematical expressions,
it can be used to produce beautifully typeset documents of any length, including books.
Home page of Blue Sky Research, the creator of Textures, an implementation of TeX and LaTeX for the Macintosh.
Visit this page for general information about TeX and LaTeX, as well as pointers to other sites in the TeXnical world.