I\'m looking for a tool that gives me the ability to verify if my code works or

Question

I'm looking for a tool that gives me the ability to verify if my code works or not in other browsers (all?).

My problem is, I work with Macintosh (Mac / OS-X (Mavericks+)), and software like Ghostlab doesn't show me how the site works in Internet Explorer (for instance) nor old versions from browsers.

Requirements:

Works in OS-X (preferable not a VM)
Free or one payment only (not monthly)
One single tool (I don't want to have a collection of n tools, each one for a specific browser/version)
Test at least IE7+ (preferable IE6+), latest version of Chrome, Opera, Safari, Firefox. (Optional mobile.)

Items that must be able to be tested within the tool:

HTML structure (I think, testing compatibility with CSS should do the job)
JavaScript
Forms (optional)

The tool should be noob friendly or have a good documentation

Explanation / Answer

There are a variety of services which run your code across various environments, here are a few examples:
FOSS services

browsershots (most free browsers)

Paid services

SauceLabs (many browsers and mobile devices)
browserstack (many browsers and mobile devices)

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