JustJSON is a free, simple tool that lets developers quickly create, store, and manage JSON collections. Add, retrieve, and delete data with ease—perfect for testing, JSON placeholder, or mocking data for your apps.

LaunchDarkly is a feature management and flagging platform that lets teams release, test, and control new features safely in production.

A free browser plugin that helps developers, content editors, & SEO professionals quickly scan webpage for broken links, valid links & potential issues.