I imagine alot more people would use Stripe Snoop, except they have to buy and assemble some equipment. Well no more! Now Mac/Sun/SGI/HP users can run Stripe Snoop. See this entry from the Stripe Snoop FAQ:

Q: Do I need a hardware interface to use Stripe Snoop?

A: NO! Stripe Snoop plans to be the definitive program for researching and labeling magstripe data. Because of this, a new Input Mode has been added. This allows for a bitsream to be entered on the keyboard (stdin) to be parsed, decoded, and analyzed as if it came in from the hardware reader. Raw Mode has been added so that people who have a reader can output the raw bitsteam to a file. This allows for easy sharing of card info without everyone needing a card reader, and a copy of that card.

Both Raw and Input Mode are not in the current releaseof Stripe Snoop, 1.2. They are however, available in the CVS code.

Update The web view of the CVS doesn't show the updated code. You need to anonymously download the cvs tree using the following instructions:

https://sourceforge.net/docman/display_doc.php?docid=14033&group_id=1