TheUnarchiver : Unpacker for various archiving formats, e.g. rar v3. ( http://code.google.com/p/theunarchiver/ )
paq8px : Very high compression and very slow archiver ( http://encode.dreamhosters.com/showthread.php?t=342 )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a hanno
For Paludis use this rsync : rsync://gentoo.zugaina.org/hanno-portage
If you have a problem : ycarus(-at-)zugaina.org