For Windows there is Perl Oasis:
http://www.bahnhof.se/~johanl/perl/Oasis/

Blurb: Perl Oasis is a code navigator; a POD/source/class browser tightly integrated with (currently) UltraEdit (optional, but nice-to-have). It makes it easy to navigate source code, POD, modules and your files. It is a Win32::GUI application.

Disclosure: I'm the author.

/J