Protoship is a tool that can help people who want to either edit their existing webpage, or borrow an existing site as a baseline to develop their own new design from. If you use the app Sketch to do your design work, you can install Protoship as an extension on your Google Chrome browser.

Then, when you’re on a website you want to play with — use the Protoship extension to capture the site’s design, and import it straight into Sketch.

Check it out: Protoship: design, develop, and scale successful web applications