It's the Perl5 Camelcade plugin for intelliJ IDEA. I've been using it religiously (along with the Vim plugin, of course) for numerous years now.
I'm doubtful that it uses Perl::Critic, as it works just fine if that distribution isn't installed. I'm quite sure it uses its own parser, but I am not 100% sure either way. It works the exact same way with Python, JS/jQuery etc.
The only Perl distributions that I install in support of this software is Devel::Camelcadedb, which simply supplies Perl debug support within the IDE.