Usage shares of operating systems as of October 2012 [Wikipedia]
Windows 70.39% ████████████████████████
OS X 8.54% ▓▓▓
Linux 1.64% ▌
Other 19.43% ▒▒▒▒▒▒
I'm sorry if I upset you. I just assumed that the most of the DA users are using some version of Windows (Not everybody uses Ubuntu, you know...) and I'm not planing to buy a Mac, yet.
But, if it helps, this tutorial was created with Inkscape (words and background) and GIMP (everything else)