Free software from Thomas J. Merritt and Parag Patel

getoptx(3) routine for parsing command-line options

This provides an almost completely backward-compatible getopt(3) replacement that is small, simple, yet handles multi-letter options.

Parag Patel's free software

Mac OS-X source for NetBSD "tip"

Mac OS-X binary of NetBSD's "tip"

These TAR archives contain the source and binary for my port of the NetBSD "tip" program to connect to serial ports using various USB adapters. Extract them under "/" as root, and edit /etc/remote to point to your ports, whose names under /dev are vendor-dependent. (Keyspan's are /dev/cu.Key*.)  

C++ text-editing library package.

This C++ code provides complete multi-window full-screen text-editing on terminals, full undo/redo, regular-expressions, and other features. The buffer portion may be used independently to edit text from a program. 

wacco LL(1) C/C++/Java parser generator 
Generates a parser that is as close to hand-written as possible.

Z80 and CP/M emulator

TJ Merritt's free software

UTF-8 String Library

A simple library for handle UTF-8 strings as easily as 8-bit ASCII strings.