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Google Chrome Developer Tools - Get started with Google Chrome's built-in web developer tools.
Xpediter - Xpediter is a mainframe application interactive debugging tool. It also offers code coverage for mainframe application analysis.
Firefox Developer Tools - Examine, edit, and debug HTML, CSS, and JavaScript on the desktop and on mobile.
Vorlon.JS - Vorlon.JS is an open source, extensible, platform-agnostic tool for remotely debugging and testing JavaScript.
Postman - The Collaboration Platform for API Development
netquery - netquery is the system introspection tool.