I'm a member of the DARC, club S09.
One of my pet projects is working with AVR microcontrollers made by Atmel. I'm involved with maintaing part of the opensource toolchain for these controllers, commonly known as just avr-gcc. See the avr-libc project page for documentation about all this. I also wrote Mfile, a small Makefile generator for use with the AVR-GCC toolchain. More about Mfile...
There's a slightly more enhanced version of the little avr-libc demo project that can be found here.
Since it was fairly difficult to still get a datasheet for the well-known BF960 dual-gate MOSFET, I've put a copy here which I could obtain via a fairly slow link from some page at uni-sb.si.
There used to be so-called Kreiskenner (KK's) in the HAM radio era of the GDR, a list of the scanned tables of those 225 identifiers can be found here.
Here's a small project for a very simple yet effective LED flash light. Sorry, currently only available in German language.
I wrote a small library implementing one-shot timers for AVR-GCC.
I've ported some of the Atmel AVR application note code to GCC, and filed it back to Atmel. Until they officially update their appnote code on the website, you can get it here:
Application Note Files AVR065: LCD Driver for the STK502 and AVR Butterfly AVR065-gcc.tar.gz
I've been asked to port over the BASIC program of an old magazine article into the 21st century. The article is about the use of a numerical integration method called ROMBERG, the application is to calculate transitional curves for railway tracks. Sorry, German language only. Here is the resulting C program source code.