The Groff package contains the traditional UN*X text formatting tools troff, nroff, tbl, eqn, and pic. These utilities, together with the man package, are essential for displaying the online manual pages. Output can be produced in a number of formats including plain ASCII and PostScript. All the standard macro packages are supported.

front end to the groff document formatting system

Emulate nroff command with groff, see the section called "Formatting".