Updated 2011-09-02 18:30 UTC – Stable Quality
Free & Open Source license
Reads magnetic stripe cards
Using a hardware audio dongle, MagRead can read most magnetic stripe cards.
For credit cards, and ID cards issued in North America, it will also parse the
data and display it in a familiar format.
Requires that you have a hardware dongle, such as those provided by Square.
See http://blog.tehinterweb.com/ for more details