Of the many webhook debugging tools out there, respondto.it was among the first to support custom responses. Built by Aaron Lerch and launched in early 2012, respondto.it lets you create an endpoint that returns XML or JSON and displays a list of recent requests. If you're testing out a service like Twilio, this can be invaluable for quickly prototyping an idea, or even writing a simple app.
This past week, respondto.it blazed another trail, becoming one of the first sites to integrate with the new Runscope API. With just a few clicks you can import any request in your history into your Runscope bucket.
Here's a demo:
The source for respondto.it is available on GitHub and includes instructions setting up your own private instance.