RANDOM.ORG - RANDOM.ORG offers true random numbers to anyone on the Internet.
JSON Generator - Create mock and sample JSON using a powerful template syntax
GeneratorMix - A place with hundreds of generators split into different categories from science to entertainment.
OK JSON - Format and view JSON with native Mac app
Random Number Generator - Randomly generate integers or floating point numbers within a given range and specified discrete or continuous statistical probability distribution.
Excusipsum - An excuses generator for the logically challenged