[software] Groff is the GNU replacement for the troff and nroff text formatters. It is an original implementation written primarily in C++ by James Clark and is modeled after ditroff, including many extensions. The first version, 0.3.1, was released June 1990. The first stable version, 1.04, was announced in November 1991. Groff was develop...
Found on
http://en.wikipedia.org/wiki/Groff_(software)

Emulate nroff command with groff, see Section 8.1.2.
Found on
http://www.tldp.org/LDP/intro-linux/html/gloss.html
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