Ubuntu, Inkscape, LibreOffice, GIMP, Thunderbird, Rhythmbox, Scribus, PHP, MySQL, K3b, Audacity, Phoenix Firestorm (SecondLife/OpenSim Client), Dokuwiki

Also - switching IDEs, was Quanta Plus, but am leaning toward Aptana - which is based on Eclipse

Python. Nginx. Ubuntu. Android. Eclipse. TrueCrypt. Gzip. OpenSSH. PuTTY.

How about Apache? I use it every day!

Chromium and XMind.

How does "windows" qualify as an open source application? Certainly not as Microsoft(R) Windows(TM) I suppose.

I suppose it depends on how you define 'open source', but Windows has released the source to those willing to sign an NDA and all that.

I know a few people with copies.

No matter how you define open source, windows isn't it. At the best, it's been called 'shared source' in the cases you mentioned, but that is a long way from open source.

I agree, I was just trying to give the OP the benefit of the doubt.