Postman - The Collaboration Platform for API Development
TablePlus for Windows - A native GUI tool for MySQL, PostgreSQL, SQL Server & more
Mocky.io - Mock your HTTP responses to test your REST API
Postman for Mac (Beta) - Build, test, and document your APIs faster
StopLight - Stoplight is an API Design, Development, and Documentation platform that enables consistency, reusability, and quality in your API lifecycle, all with an easy, enjoyable developer experience.
API List - A collective list of APIs. Build something.