HTTPie for Terminal - Developers all around the world rely on HTTPie for API testing.
Runscope - Log, monitor and measure your API usage to solve API problems fast.
ReqRes - A hosted REST-API ready to respond to your AJAX requests.
Thunder Client - Rest API client for VS Code, lightweight Postman alternative
hideAPIkey - Hide your API key from your front end
LoadFocus - Cloud Testing Infrastructure | Cloud Testing Services and Tools for Websites & APIs.