Attached Link: http://www.apophysis.org/

Join the Apophysis mailing list. Every message on the list has a link to the beta at the botton, so wait for a message to appear or post one yourself. The idea of making the beta only available to list members is so that they can be kept informed of updates, post bug reports, and also so they can read whatever I have to say about using the program (since documentation is very sparse at the moment).