Sorry, but BrowserStack and Sauce Labs are just services that offer VMs with browsers.
You still have to write your own Selenium framework, you still have to store your tests in a repository, you still have to do all the work.
We use Endtest because it offers an easy way to create and execute tests and a cross-browser cloud infrastructure.
Endtest looks good. I never had a chance to try it. I had used browserstack for some of my projects. They have an open-source grants program that lets you use browerstack for free for your open source project.
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