Download a fast and free operating system that fits on a floppy
I've shown you Knoppix STD and PHLAK, both great bootable operating systems, but neither is small enough to fit on a floppy. In my quest to bring you the ultimate arsenal of cool tools to keep in your backpack, I present you MenuetOS.
I'm impressed with this tiny, 100-percent free, open-source OS written in assembly. You programming buffs know that assembly, pretty much the mother of all languages, can work blistering fast when used correctly.
MenuetOS includes the tools you'll need to modify and compile the kernel and applications. Plus, it has a good-looking graphical user interface, and you can skin your application windows.
Visit MenuetOS.org to download MenuetOS and get its full list of features.