I released some scientific freeware once. It uses a PC soundcard to count clicks from a 1960s geiger counter and logs them digitally. Basically gives a vacuum-tube based detector a much larger integration time, allowing for more sensitivity. Makes graphs, logs to files, even has a webserver. You can graph radon decay using this civil defense instrument!
It works on every Windows OS from '95 to XP, but not Vista, of course. Its totally self contained, no dll hell.
http://sourceforge.net/search/?type_of_search=soft&words=cdvcounter
I wrote this because I found the yahoo group CDV700Club
and bought a Victoreen CDV-700. I actually already had a LND-720 based mica-windowed GC that I had bought to play with when doing crypto (for RNGs) which used serial port communications, and also had a crude, DOS-based grapher.
