CyberChef
Focus: data conversion, encoding and developer tools. Also in Workflows and Automation, like Mockaroo. Free (Mockaroo: Freemium). Adds Offline. Rated 4.8 (Mockaroo: 4.6).
Web App
Generate realistic test data in CSV, JSON, SQL and Excel formats.
Built with love by Shushant Lakhyani. Building bestproductivityresources.com
Mockaroo creates realistic fake data such as names, emails, addresses and dates, with more than 150 field types you can arrange into your own schema. The free plan generates up to 1,000 rows per file and 200 API requests a day, and paid plans raise those limits.
Developers and testers who need sample data for demos, prototypes or database seeding.
People who never work with databases or spreadsheets of test data.
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