Thunder Client - Rest API client for VS Code, lightweight Postman alternative
Sheetsu - Turn Google Spreadsheet into API
Postman - The Collaboration Platform for API Development
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
Simple API Generator - Instantly generate openapi (OAS) 3.0.0 CRUD APIs
grepQL - GraphQL IDE - Generates every queries from the schema