Are there any other operating systems besides Windows and Mac?
Yes there are quite a few although most are very uncommon.
Linux runs of 5% of computers. That makes it the 3rd most popular OS. About half of Linux users use Ubuntu. The other popular versions of Linux include: Debian, Linux Mint, Mandriva, Suse and Fedora to name a few.
Other operating system that are notable enough to mention include: BSD, BeOS and Solaris.