roff(7) - phpMan

colcrt (1)           - filter nroff output for CRT previewing
eqn (1)              - format equations for troff or MathML
geqn (1)             - format equations for troff or MathML
gnroff (1)           - emulate nroff command with groff
gpic (1)             - compile pictures for troff or TeX
groff (1)            - front-end for the groff document formatting system
grops (1)            - PostScript driver for groff
grotty (1)           - groff driver for typewriter-like devices
gsoelim (1)          - interpret .so requests in groff input
gtbl (1)             - format tables for troff
gtroff (1)           - the troff processor of the groff text formatting system
nroff (1)            - emulate nroff command with groff
pic (1)              - compile pictures for troff or TeX
pod2man (1)          - Convert POD data to formatted *roff input
Pod::Man (3pm)       - Convert POD data to formatted *roff input
Pod::Perldoc::ToNroff (3pm) - let Perldoc convert Pod to nroff
poweroff (8)         - Halt, power-off or reboot the machine
preconv (1)          - convert encoding of input files to something GNU troff...
soelim (1)           - interpret .so requests in groff input
systemd-poweroff.service (8) - System shutdown logic
tbl (1)              - format tables for troff
troff (1)            - the troff processor of the groff text formatting system
zsoelim (1)          - interpret .so requests in groff input