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9 open source operating systems that aren't Linux

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 ...
MUO on MSN

5 tiny operating systems that only do one job and never complain

These operating systems treat extra features the way budget airlines treat legroom.
Liliputing

This tiny single-board PC is designed to run an open source version of Chrome OS

The XpressReal T3 is a single-board computer (SBC) that looks like a slightly larger Raspberry Pi Zero. 2 W. But the T3 has a faster processor, more memory, onboard storage, more ports and connectors, ...
ZDNet

Microsoft finally open sources DOS 1.0 - and it's so much more than the code

PC-DOS 1.00 would lead to Microsoft becoming computing's top dog Microsoft continues to embrace open source. The source code and annotations provide insight into the operating system's earliest days.