So, I didn't find an awful lot of runes software that would run on linux, however this tarot program:
http://www.winsite.com/bin/Info?500000021266
Ran easily. I just installed wine, no extra configuration was required, the software installed and ran perfectly.
It's a nice little tarot program, with three spreads and nice, concise explanations of the meanings of the cards. The graphics are nice, although a little small on my screen (which may simply be because I'm running it on linux, windows users, let us know ^_^ )
I would recommend it for a quick reading, or perhaps to help familiarise yourself with the cards somewhat. The meanings given are somewhat brief, but to the point. Also includes the numerological values of the cards, which is a nice touch.