Michael Koch told me gcjwebplugin entered Debian unstable yesterday on powerpc. Not yet available but apt-get source and rebuilt it myself just works on powerpc, thanks Michael (upstream and Debian Maintainer).
I tried it and found some bugs but I have also been surprised it works very well with an old applet. I was looking for 'etch' because I did not remember it from Toys Story and found this site: http://www.etch-a-sketch.com/html/onlineetch.htm with an 'Etch-A-Sketch' Applet. And it did work! ().
Many thanks Michael!