Installing an operating system, even if it's in VirtualBox, can take quite some time. If you want to try out lots of different Linux distributions, this will become very time-consuming. But guess what: there's a website which provides VirtualBox images of several free and/or open-source operating systems, such as GNU/Linux or Free/Net/OpenBSD.
You know what Ubuntu is, so we will not talk about it in this article. Instead, we'll talk about some or the most popular Ubuntu-based distributions. There are enough (or not) Linux distributions derived from Ubuntu, so we thought it will be a very good idea to make a list with all of them, or at least the popular ones.