If you hear the term "open-source," you might think of Linux. However, Linux distros aren't the only open-source operating systems. There are plenty in use today besides Linux. Some date back to even ...

Looking for non-Linux open-source options? From ghosts of past operating systems to fascinating works in progress, here are my top picks.

I published a version of this article on Medium eight years ago. This version is updated with new references and arguments. Over the last few years, I’ve been a part of lots of discussions — across ...