Irony also includes a quite useful "Grammar Explorer" app that's helpful for testing & debugging grammars.
Yes, it's absolutely in the same vein, though Piglet is intended for smaller uses than using for full languages. I was gunning for a small tool that's easy to use an easy to integrate, and with the coolness factor and useabilty that fluency gives you.
Irony is a great tool indeed!
It's definitely got the coolness factor; I really like how the fluent interface works out. Have to say, given the number of brittle, cobbled-together hand-written mini-parsers I've both produced and used, I wouldn't mind seeing this take off. :)