Internal Program Version: GNU Troff  1.23.0

The groff-full package provides aditional tools excluded from base groff
package, like grohtml, X fonts et. all.

Groff is used to "compile" man pages stored in groff or nroff format
for different output devices, for example, displaying to a screen or in
PostScript(tm) format for printing on a PostScript(tm) printer. Most
programs store their man pages in either /usr/share/man/ or
/usr/X11R6/man/.

http://www.gnu.org/software/groff/groff.html