mdz is a Mandelbrot Set explorer and image renderer. The Mandelbrot Set is perhaps the most famous fractal.
Unlike other similar software for Linux (as far as I am aware), mdz is the only application that allows you to zoom in deeper than your hardware's native floating point support allows. MDZ uses the GMP and MPFR libraries for multiple-precision floating-point computations to allow deep exploration of the M-Set beyond where ordinary precision floating-point calculations fall apart.
mdz-0.1.1 fixes a couple of problems by removing a minor feature which probably went unotticed by all but the most technical and inquisitive minds. mdz-0.1.1 now forces all images to be saved in the RGB format. Older versions only saved to RGB format if colour-interpolation or anti-aliasing were in use. Forcing RGB format in the saved image fixes some problems related to limitations in palette indexes.
Another new feature release - archive/mdz-0.1.0 goes against my previous statements of MDZ never rendering any other fractal type than the Mandelbrot Set. This new release includes 3 fractals new to MDZ. These are the Burning Ship fractal, Generalized Celtic, and a variation of the Generalized Celtic I decided to call "Variant".
archive/mdz-0.1.0 also makes available a slightly faster multi-precision maths mode which uses GMP instead of MPFR. GMP may not produce as high-quality images as MPFR and for that reason, MPFR rendering is still available by selecting the "Correct Rounding" mode.
Finally, a fix worth mentioning is for when duplicate is used (from the file menu) or zoom-in-new-window is used. Both of these invoke a new instance of MDZ like they always have done, but now they don't loose image dimensions, anti-aliasing settings, or threads settings.
A new feature release - archive/mdz-0.0.9 adds improvements to the colour palette manipulation dialogs. Gone are the colour-scaling, random-palette, function-palette, and colour-cycling dialogs, and in comes one single tabbed notebook dialog along with a display of all the colours in the palette. The palette display can be dragged with the image updated as the colours are dragged for fine tuning of the palette offset position.
The introduction of the draggable colour display has caused an incompatibility* between mdz-0.0.9 MDZ settings files and older versions of MDZ. However, older MDZ settings files are compatible with mdz-0.0.9.
*The incompatibility is a result of now using an offset value for colour cycling instead of the old way of changing every colour in the palette.
mdz is on Freshmeat.net where you can subscribe to receive notification when mdz is updated.
There is also an mdz source repository at http://github.com/jwm-art-net/MDZ though it's mainly for backup.