Nroff Troff AWF Groff (software) Heirloom Project Refer (software) Roff (software) Joe Ossanna Eqn (software) Elvis (text editor) JED (text editor) List of Plan 9 applications Mandoc PWB/UNIX Jerry Saltzer Coherent (operating system) Peter Samson TYPSET and RUNOFF Applix 1616 Markup language Killer application OS-9 Macro (computer science) Unix IBM AIX Sentence spacing Writer's Workbench Research Unix Linux From Scratch