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groff?groff (GNU roff) is a typesetting system that reads plain
text input files that include formatting commands to produce output in
PostScript, PDF, HTML, DVI, or other formats, or for display to a
terminal. Formatting commands can be low-level typesetting primitives,
macros from a supplied package, or user-defined macros. All three
approaches can be combined.
A reimplementation and extension of the typesetter from AT&T
Unix, groff is present on most POSIX systems owing to
its long association with Unix manuals (including man pages). It and
its predecessor are notable for their production of several best-selling
software engineering texts. groff is capable of producing
typographically sophisticated documents while consuming minimal system
resources.