With an endless combination of modern and legacy browsers for users to choose from (depending on their system capabilities), it's our responsibility as designers and developers to ensure the websites we build perform adequately.

Testing multiple browsers on multiple platforms isn't just difficult — it can be virtually impossible without the correct resources. However there are tools that let you comprehensively test your website, and check if it successfully displays across various browsers, platforms and resolutions. That way, your users will receive a positive, user-friendly experience no matter what their setups are.

See also: 17 Bug and Issue Tracking Apps for Developers

Below is a curated list of both free and premium cross-browser testing tools, ranging from cloud platforms to desktop applications. These tools will help you easily test everything from versions of Internet Explorer versions to more than 300 modern browser combinations.