Postman - The Collaboration Platform for API Development
Ping-API - Automated API testing and monitoring.
Thunder Client - Rest API client for VS Code, lightweight Postman alternative
HTTPie for Terminal 2.6.0 - Developers all around the world rely on HTTPie for API testing.
Swagger Inspector - Free online tool to test APIs and autogenerate documentation
Runscope - Log, monitor and measure your API usage to solve API problems fast.