Typesetters The history of troff Free troff implementation OpenSolaris-derived port of troff and related programs User manual for the Plan 9 edition of troff (In PostScript format) A History of UNIX before Berkeley section 3 describes the history of roff, nroff, troff, ditroff, tbl, eqn, and more. The original source code of nroff, troff and the preprocessors from AT&T Bell Labs in form of the Documenter's Workbench (DWB) Release 3.3 (ported to current UNIX systems from http://www2.research.att.com/sw/download) Free typesetting software Page description languages History of software Plan 9 commands Unix text processing utilities