- gxditview, which is used to display the output of the X* devices, and
can also be used to view PostScript output from groff;
- grn, a preprocessor for pictures in the 'gremlin' format;
- tfmtodit, which creates font files for use with 'groff -Tdvi';
- hpftodit, which creates font files for use with 'groff -Tlj4';
- afmtodit, which creates font files for use with 'groff -Tps';
- refer, which preprocesses bibliographic references for use with groff;
- indxbib, which creates inverted indices for bibliographic databases used
by 'refer';
- lkbib and lookbib, which search bibliographic databases;
- addftinfo, which adds metric information to troff font files for use
with groff;
- pfbtops, which translates a PostScript font in .pfb format to ASCII for
use with groff;
- mmroff, a simple groff preprocessor which expands references in mm;
- pic2graph, which converts PIC diagrams into cropped image files;
- eqn2graph, which converts EQN equations into cropped image files.
