CaPerl is a system that implements capability discipline in Perl. It does this by introducting a few extra language constructs, and by restricting what untrusted code is allowed to do. The CaPerl language is compiled into standard Perl which can then be run by a completely standard Perl interpreter. However, untrusted code is prevented from doing anything its trusted (or untrusted) wrapper did not intend it to do.
You can download the CaPerl system from here.
So far, there isn't any to speak of. In the mantime, the slides for a talk I gave at USENIX Security may give some hints - apart from that, use the source and send me patches! Or ask questions - I'll try to answer in the form of documentation.
There is a mailing list here.
I don't yet have a tracking system, so just write to the list if you have problems.