Here are some historical open source projects that he wrote:
Wavechild 670 (GPL license)
A wave digital filter-based emulation of a famous stereo tube limiter from the 1950's.
Turn-taking measurement tools (BSD-style license)
Tools for measuring the quantity of turn-taking present in the behaviour of a group of agents.
He's gotten a lot better at programming since then! But since he's been doing software commercially, his later work is not open source.
