Modern CSV - A CSV editor/viewer
Mockaroo - A realistic data generator to test your app
Rons CSV Editor - Rons CSV Editor / Now Rons Data Edit
JSON Generator - Create mock and sample JSON using a powerful template syntax
CSVpad - CSVpad is a handy free CSV (Comma-separated values) editor.
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.