I have written a tool called 'svnplot' (which I admit was inspired by the output of StatSVN). Its written in python and available on Google code. http://code.google.com/p/svnplot. You can see the sample output at http://thinkingcraftsman.in/projects/svnplot/index.htm
The details/output are not as elaborate as 'fisheye'. Basically it converts the Subversion log history into a 'sqlite' database and then queries sqlite database to generate graphs. You can write your own queries using the created sqlite database.
See if it works for you.