Json_endpoint is a project mainly written in Python, it's free.
A simple cherrypy app that serves up different bits of JSON to help test JSON-consuming apps locally.
json_endpoint is a simple CherryPy application which provides a few different urls that each serve a different bit of JSON.
It's intended to be used locally when you need to quickly test some JSON-consuming app and don't want to focus too much on the details of the JSON data.