Most of the tools regarding cross browser testing of a website comes with free trials and paid version. So running these tools with free trial version is cool but it comes with limitations. According to my experience, so far the best tools for free trial versions and with good results are :
- Most Reliable Mobile App & Browser Testing Platform | BrowserStack
- Live interactive cross-browser testing
- Free Cross Browser Testing Tool on Cloud | Selenium Automation Testing
- Check Browser Compatibility, Cross Platform Browser Test
- IETester / Browser Compatibility Check for Internet Explorer Versions from 5.5 to 11
Even Microsoft has provided free software for cross browser testing. No payment is required. Download Expression Web SuperPreview from Official Microsoft Download Center. Its reviews are pretty good. You can try this tool.