Browsershots.org is a free service that generates screenshots of your web design on a wide number of Windows, Mac, and Linux browsers. Enter your web address and click “Make Screenshots.” After 10-45 minutes (depending on current loads) you’ll get screenshots of your site as displayed on a variety of different Windows/Mac/Linux browsers. The interface can be confusing at first, but it is a great free service.
http://Browsershots.org

SiteVista.com is a commercial web page testing service. You’ll pay to use SiteVista, but the interface is clean, friendly, and fast. They provide tests on a wider range of platforms — with frequent updates. For designers who bill for their time, the modest fee may be worth it for faster results. Try it out for as little as $9/day.
http://sitevista.com

BrowserCam.com costs more than the other two in our list, but provides testing on the largest variety of different OS and browser combinations. Two other features set BrowserCam apart: The first is a special VNC remote access service that allows you to test interactive design elements such as pop-down menus, rollovers, or flash animations. The second is inclusion of several mobile browsers such as BlackBerry, and Windows Mobile. BrowserCam.com offers a free 24-hour trial, with plans starting at $19.95/day.
http://BrowserCam.com

Anybrowser.com
http://www.anybrowser.com/

Browser Camp
http://www.browsrcamp.com/

Safari emulators
http://www.danvine.com/icapture/
http://www.snugtech.com/safaritest/