Whenever you don't have a perl installation or a commandline available, or you want to show somebody else information about core modules, you can use:

http://perlpunks.de/corelist

The website has been around for some years, but wasn't very well known and actually a bit ugly. I've redesigned it, added a new diff function and moved it to a new server where it can run under mod_perl.
The diff function allows you to compare two perl versions for added, removed or changed modules.

I'm also thinking about auto completion but m…