I've used cross-browser testing tools like Adobe BrowserLab, Browsershots & Expression Web SuperPreview but didn't know there were a dozen more.
Smashing Magazine has done an exhaustive review of all available cross-browser testing tools with a nice tabular summary at the end for easy comparison. It covers the following list of tools -
Free:
- Adobe BrowserLab
- Browsershots
- Expression Web SuperPreview (free and commercial)
- Lunascape 6
- IETester
- IE NetRenderer
- Spoon
- Sauce Labs (free and commercial) - 200 free minutes/month
- Browsera (free and commercial)
- Browserling (free and commercial)
- Mogotest
- Cloud Testing
- BrowserCam
- Multi-Browser Viewer
- CrossBrowserTesting