Thanks for starting this forum Audre, I saw a post of yours on Usenet about it, I think. And thanks to Judith for letting us know in the MBF users group. The link to Paul's website and MBF has already been provided and I'd also like to give a couple of links to the limited freeware version, Mind-Boggling Fractals Lite, http://www.simtel.net/pub/pd/54429.shtml, and http://www.completelyfreesoftware.com/cfs_update192.html
It will give you a taste for the program and is not crippled to stop working after a time, but it is very limited in the number of rendering methods, equations and has no capability of user defined equations like the full version.

Fractal Explorer has many capabilities that go beyond Tierazon, Sterling, etc., but should be familiar to users because Stephen Ferguson has helped the authors of FE. There is a very good stable beta version for download at http://www.eclectasy.com/Fractal-Explorer/download.htm and there is a beta 11 version out, that will be released soon, that has image layering and manipulation capabilities. The authors are working to include many popular features of other programs like Ultra Fractal. It also handles 4D, IFS and landscape imagery.

Probably the single most important resource that has evolved from the original sci.fractals Usenet newsgroup is the Fractal Art FAQ, developed by Jean-Pierre Louvet and Juan Luis Martinez; http://fractals.iuta.u-bordeaux.fr/f-art-faq/ It contains many links and links to the usual exhaustive resources for fractals. Also the FAQ can be downloaded to your hard drive and a desktop link to the index HTML allows you to use it whenever you want, as well as have direct links when on line.
Doug