From L'anePOS Point-of-Sale System:
Some people have asked about other front ends, so this release contains two new front ends to the Register class: a stress/load tester that generates random sales, and an X11 (via Tk) front end. The Tk front end is made to look like the Curses front end. It is only intended as a proof of concept, not a deployable system. The Tk fe is LanePOS/register/examples/registerQuickTk and the tester is LanePOS/backOffice/utilities/registerTester .