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.

Open-source or commercial off-the-shelf (COTS) operating systems? In an era of safety-critical embedded systems, the debate among developers is shifting. Embedded systems are the invisible backbone of ...