Website: responsively.app
A modified browser built using Electron that helps in responsive web development.
Features
Mirrored User-interactions across all devices. Customizable preview layout to suit all your needs. One handy elements inspector for all devices in preview. 30+ built-in device profiles with option to add custom devices. One-click screenshot all your devices. Hot reloading supported for developers. Please visit the website to know more about the application – responsively.app
github.com/manojVivek/responsively-app/blob/master/README.md