freshtel FT-102 VoIP USB phone driver
Linux driver for USB handsets. This has been successfully tested (and developed) with the Doro 225ipc phone.
It should work with other phones using the same chipset.
electronics
Various hardware projects, the most advanced one being the
USB Logic Analyzer.
software
Some small software programs I have developped ; the most popular being
PictoSniff, a program allowing you to eavesdrop
on
PictoChat conversations between Nintendo DS consoles using a wifi card and a FreeBSD box.
ti89 projects
Some stuff for the well-known TI89 graphing calculator.
IR Messenger is a program to chat between two calculators
using an infrared link (the hardware is relatively easy to build).
kDriver lets you use any PS/2 keyboard with the calculator, using
an extremely simple hardware adapter.
inside electronics
Take a look at what's inside commercial electronic devices.