Tracer is an open source application built with Glade and the GNU toolset. It runs under Linux (includes RPMs).
Tracer is GPL licensed, so full source code is available. For those familiar with the GNU toolset and interested to write they're own applications
for BitScope, Tracer is a good reference.
As Ryan says, "It's in pretty rough shape at the moment, and I don't have much time
to work on it. Still, if you find it useful, I'd be interested in hearing from you".