gWcalc is a graphics front-end for Kyle Wheeler's excellent Wcalc scientific calculator. It uses the GTK+ toolbox, and adds extensive configuration and session history possibilities.
We are going to make a multipurpose librairy for the Texas instrument 68k calculator (TI-89 & TI-92+)
We are planning to add optimized graphic routine, and a lot more...
Grayscale graphic will be added too, of course :)