I've a soft spot for GPL stuff - especially OSes. I dig a little Debian and Fedora occasionally, plus I play with Red Hat and SUSE distros. I really like where things are going with Ubuntu, et al. I'm playing with Kubuntu just now, since I like KDE better than the other desktops. I haven't toyed with KDE's Plasma just yet, but it sure looks interesting.
Here's some guitar stuff: http://maketecheasier.com/5-essential-linux-apps-for-guitarists/2009/12/03#more-8851
I've been playing with abandonware a little. Not open source, but fun anyway. I just got Windows 3.11 and MS-DOS 6.22 running on a virtual machine. I know, not too useful. It is fun, though, and a bit challenging to get it going. I've been tinkering with Windows 1.01, but no joy yet. I can't seem to build a VM small enough. 1.01 needs 256k of RAM and Virtualbox won't go below 4GB. I'm not sure if that's the problem or if it just doesn't like DOS 3 or what. Other people have conquered it, so I'll get it sooner or later. I'm thinking of building a physical 286 machine just for the fun of it.
Back to GNU: I just bought a 10V from Dell for my oldest daughter and I'm thinking of Kubuntu Netbook Edition with KDE Plasma when 10.04 stabilizes. It's got XP now, which I've fully updated and configured. I'll image it as soon as she's set her passwords as a failsafe in case she doesn't think Tux is as cool as I do.
Sorry to type a book here. I don't normally let my geek-side out of the closet.