5 cross-browser testing tools to try today | Creative Bloq
MQtest.io — A simple tool to help identify which media queries your device responds to.
Free Mobile Performance Testing with Akamai's Mobitest
Test your website performance on a mobile device
iChat Contact Testers
Useful to test your iChat/Message settings and bandwidth settings
Screenqueri.es | Pixel Perfect Responsive Design Testing Tool
Sweet
8 Popular online apps to test the mobile version of your site
Install multiple versions of IE on your PC | TredoSoft
For use on Windows