Hello,
I built a Perl client for Google APIs Discovery Service.
I have samples for Plus API and URL Shortener API though. I'll add other samples later.
This module is in Alpha and still under development currently.
If you're interested in Perl implementation, please try this module.
And if you have any questions or any suggestions, please feel free let me know at google-api-perl-client Google Groups.
Best Regards,
--shigeta