Gmail is run as a web-service. It is running on, well whatever servers Google bought for them. I doubt Google is really going to publish their code for the gmail server, so we can't know the dependencies, and you can't get gmail.
That said, you can *use* gmail over the web. All you need is a decent web browser. Even links could do it for me, so I doubt you'll have much trouble. Just go to
www.gmail.com
