BrowserSeal is the fastest multi browser website screenshot tool available today. It allows you to capture an image of your web site under multiple browsers with a single click of a mouse and instantly inspect the differences. It runs on all versions of Windows and supports Internet Explorer (IE6, IE7 and IE8), Firefox (3.0 and 3.5), Google Chrome, Opera (8, 9 and 10) and Safari (3 and 4). It is not just a screenshot application, it comes with standalone versions of all major browsers, allowing the developer not only to verify the web site layout under all browsers, but also troubleshot the issue in case of a problem.

Spoon allows you to run any browser right from your own browser. Ot requires the download of a plugin and works through virtualization to bring you popular browsers like Internet Explorer, Firefox and Safari.

Litmus shows you screenshots of your websites as they look across all major web browsers.Super-fast, iterative compatibility testing is now easy, reliable and affordable. There's a huge array of browsers you'll have access to 24 hours a day:

SuperPreview is meant to simplify the process of testing and debugging layout issues across different web browsers and platforms. You can view your pages in multiple browsers simultaneously or view how a page renders in a browser and compare it to a comp or mock-up image of a page.

Cross browser compatibility testing across browsers and operating systems. Automated screenshots and Live browser testing of ajax, css & javascript.

Browsrcamp allows you to test the compatibility of your design with Mac OS X browsers. Their premium service allows you to take control over a Mac OS X system preconfigured with all the Mac browsers. This is the easiest way to test every aspect of your website on Mac, including Javascript, DHTML, Ajax, Flash, etc

Browsershots makes screenshots of your web design in different browsers. It is a free open-source online service created by Johann C. Rocholl. When you submit your web address, it will be added to the job queue. A number of distributed computers will open your website in their browser. Then they will make screenshots and upload them to the central server here.

BrowserCam allows you to preview your web design on any browser running under any platform (operating system). It will also check for JavaScript, forms, and any other dynamic features of your site. Instead of serving screenshots, it allows you to remotely login the different testing maching.

Adobe BrowserLab allows you to preview and test your web pages on leading browsers and operating system - on demand. It makes it easier and fast than ever before to see how your design appears to your customers and audience. Get your results in real team, from virtually any computer connected to the Web.