Hoppscotch : A free, online, open source API request builder
Web Developer : The Web Developer extension adds various web developer tools to a browser. The extension is available for Chrome, Firefox and Opera, and will run on a...
Crosswalk : Include the Crosswalk Project web runtime with your hybrid Android or Cordova / PhoneGap app, and users will consistently see it through a predictable...
BackstopJS automates visual regression testing of your responsive web UI by comparing DOM screenshots over time.