Perl 6 for Perl 5
Inline::Perl6 makes Perl6 code, subs, and objects available to perl5 code.
v6 is an outdated project to bring Perl 6 to perl (the Perl 5 interpreter).
In general, Perl 6 features have inspired new features in perl5, as well. If you know a good address that talks about this, please add a link here.