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

Want a blast from the past? Microsoft just open-sourced its very first operating system, offering a rare insight into the ...
ZDNet

Linux Foundation backs security-oriented seL4 microkernel operating system

However, SeL4 can be used, in theory, as a foundation for Linux and other Unix related operating systems. For example, it was briefly considered for use in Richard M. Stallman's still-born Gnu Hurd ...
How-To Geek on MSN

5 open-source operating systems everyone mistakes for Linux

FreeBSD, Haiku, and other systems everyone mistakes for Linux are actually their own OS outside of the system that you are ...
The Next Platform

The Cloud Outgrows Linux, And Sparks A New Operating System

Ultimately, every problem in the constantly evolving IT software stack becomes a database problem, which is why there are 418 different databases and datastores in the DB Engines rankings and there ...
Hackaday

FRED Comes To Hobby Operating Systems (and Linux)

Those who have worked on a hobby operating system for x86 will have interacted with its rather complex and confusing ...