I have downloaded the clients and uploaded them again to my webspace. Strangely, I didn't need a proxy now - some weeks ago, the website was denied for me, too.

So, just go here to download the clients:

http://mystwalker.de/sb/fatphil/orgmathssierpinski.html


He posted a eMail address on his page:

fatphil@asdf.yesthisispissingmeofftoo.org

I guess you have to remove the last but one "word".