This one is made with 'Fraxplorer', it's a plugin which works in Photoshop or Paintshop Pro. I use Fractal Explorer a lot, and also Ultra Fractal. Some of these programmes are free, other you have to buy.
They are all great fun, and very very addictive
If you go to
here on DA, you'll find lists and links to every fractal making programme, plus all sorts of hints, tips, and tutorials
Hope this helps, and I'm so pleased you like my work