Hoppscotch : A free, online, open source API request builder
Squoosh : Squoosh is an image compression web app that allows you to dive into the advanced options provided by various image compressors.
Seashells : Seashells lets you pipe output from command-line programs to the web in real-time, even without installing any new software on your machine. You can u...
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.