There is also a
free software version of nroff in the
groff package emulating the AT&T version, widely used by Unix-like operating systems. The
Minix operating system, among others, uses a clone of nroff called
cawf by Vic Abell, based on awf, the Amazingly Workable Formatter designed in
awk by
Henry Spencer. These are not full replacements for the nroff/troff suite of tools, but are sufficient for display and printing of basic documents and
manual pages. In addition, a simplified version of nroff is available in
Ratfor source code form as an example in the book
Software Tools by
Brian Kernighan and
P. J. Plauger. ==See also==