Polypane - The browser for ambitious web developers that want to 5× their quality and efficiency.
Responsive Viewer - View multiple screen dimensions in one view
CSS Scan - Instantly check or copy computed CSS from any element for only ~95$
Responsive Website Test - Test any website on desktop, mobile, and tablet
Wireframe for Figma - Lightning fast wireframing on figma (500+ elements)
LT Browser by Lambdatest - LT Browser is a free dev friendly browser for developers and testers. You can see mobile view of website on different screen sizes and resolution on 50+ pre installed view ports. You can build, test and debug your website faster then ever.