Responsive Viewer - View multiple screen dimensions in one view
Responsive Website Test - Test any website on desktop, mobile, and tablet
Multi Screen Test - Test your site at different screen resolutions & devices.
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.
Am I Responsive - see your website in multiple screen resolutions
I Love Adaptive - See how the site is displayed on different devices