Postman - The Collaboration Platform for API Development
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Postman for Mac (Beta) - Build, test, and document your APIs faster
curl.io - Share your files from your Terminal / SSH
RapidAPI - API marketplace for finding and connecting to the world's top APIs.
Thunder Client - Rest API client for VS Code, lightweight Postman alternative