A test data generator online, no registration to generate data files directly in the browser. An API is available (You must create a free account)
JSON Generator - Create mock and sample JSON using a powerful template syntax
Mockaroo - A realistic data generator to test your app
OK JSON - Format and view JSON with native Mac app
Dummi - The smart way to generate random data for your projects.
Excusipsum - An excuses generator for the logically challenged
Get Mad Ideas - Find and share ridiculous app ideas