Mandel Explorer, as the name suggests is a Mandelbrot set explorer, with VESA support, (so, you can generate fractals up to 1600x1200 if your vesa driver supports). Still DOS (and Pascal), but for your own purposes, the source packages contains a VESA.H header file for C++ applications... so if you are in a nostalgic mood...
I have experienced some problems with latest video cards... the VESA does not seem to work very good... try with oldest cards if you have any issues.
(c) 2006