sc Spreadsheet Calculator

The Heirloom Documentation Tools: troff, nroff, and related utilities

The Traditional Vi (vi with many enhancements from Gunnar Ritter)

Recursive file compare tool

Text terminal directory diff tool

Original Documenter's Workbench Release 3.3

troff ported from Plan 9

The final release of the original vi

vi version 3.6 (from 4.0BSD, November 1980)

vi version 3.2 (from 3BSD, January 1980)

vi version 2.2 (from 2BSD, May 1979)

The very first version of the original vi (version 1.1 released on January 1, 1978 on 1BSD)

Port of 9front troff to UNIX

General purpose AVL binary search tree library

Heirloom doctools webpage

Plain TeX book layout macros

The original vi (version 3.7 released in October 1981 on 4.1cBSD)

doctools of OpenSolaris revision 0