Thunder Client - Rest API client for VS Code, lightweight Postman alternative
Stellate.co - Everything you need to run your GraphQL API at scale
Postman - The Collaboration Platform for API Development
Losant Kiln - The fastest way to build APIs for IoT applications
Sheety - Turn any Google sheet into an API instantly, for free. Power websites, apps, or whatever you like, all from a spreadsheet. Changes to your spreadsheet update your API in realtime. Neat
GraphQl Editor - Editor for GraphQL that lets you draw GraphQL schemas using visual nodes