Responsively - Develop responsive web-apps 5x faster!
browserling - Live interactive cross-browser testing from your browser.
Figma Map Maker - Figma plugin to generate map, supporting Google Maps, Mapbox
BrowserStack - BrowserStack is a software testing platform for developers to comprehensively test websites and mobile applications for quality.
Sizzy - The browser for designers and developers
Browsershots - Browsershots makes screenshots of your web design in different browsers.