BrowserShots is a free browser emulator that generates screenshots of your website under hundreds of browser versions in a matter of minutes (faster if you’re willing to pay $29.95 a month for priority processing).

So, if you need to know how your website design renders under an ancient release of Internet Explorer or the latest Iceweasel for Linux, BrowserShots is your saving grace, especially with BrowserPool defunct and BrowserCam closing down its service on February 1, 2013.

If you’re looking for something more comprehensive for website testing, Cross Browser Testing is a paid service that lets you specify live testing combinations of browsers, operating systems, platforms, and plugins. Pricing is based on number of users as well as minutes per month.