I just made a meager donation to the Haiku OS project.
If you are not familiar with this up and coming, free clone of the amazing BeOS, you can check it out here:
http://haiku-os.org/Keep in mind that you will probably be better off checking it out under a virtual environment, unless you are lucky like me and happen to own supported hardware.
Also to note is that this project is still in Alpha (as clearly stated) so it is not technically at version 1.0 yet, but even being in early alpha, it shows a lot more promise than many of the older alt os variants out there at present.
Check it out!!!