The world's smallest programmable RPN calculators ever. The complete family DM-11, DM-12, DM-15 and DM-16.

Open source optical spectrometer based on Arduino.

Description of various electronic circuits, including measurement results. Mostly in german (there is some english content, which I have not yet read).

Smart card to securely store up to 3 keys and use them via USB for gnupg, Truecrypt and some other applications.

Home-made network attached storage unit.
On 2022-11-15 this page no longer exists.

Mixed-signal oscilloscopes with USB or Ethernet interfaces.

OpenVizsla is an open source, high-speed USB sniffer that will help decode, debug and hack proprietary USB hardware devices.

Collection of open hardware designs.

Instruction for the installation of the printer driver for Canon LBP3100 and similar printers.

Program to construct timing diagrams, written in Java. The TimingAnalyzer is free to use by anyone without any limitations and is currently licensed as Freeware while beta testing. When the first final version 1.0 is released, the license will change to Commercial. The Commercial license requires businesses to purchase the program, but it will continue to be free for personal and academic use. The estimated cost of the program will be low and affordable for small companies.