WatchVarnish is a project mainly written in Perl, it's free.
A varnish status monitor
This is a program somewhat similar to varniststat except that it will monitor a set of varnish servers instead of just a single server. A companion program, webnoded.pl, must be installed on each of the varnish servers and run by xinetd. When you telniet in to port 7600, the webnoded.pl program responds to commands to dump varnish stats.
David Newhall II had the idea for this program. Lee Doolan wrote the code.