Mockaroo - A realistic data generator to test your app
Noisli - Noisli is a fantastic background noise and color generator for working and relaxing. Online soothing ambient sounds like White noise, Rain and Coffee Shop.
JSON Generator - Create mock and sample JSON using a powerful template syntax
Noizio - Feeling that the noise of the big city is too much for you to bear?
Softbuilder SB Data Generator - SB Data Generator is a simple and powerful tool to generate and populate selected tables or entire databases with realistic test data.
MyNoise - Custom shaped online noise machines. Many Many generic sounds