Operating systems that are an alternative to the more mainstream (Microsoft, Apple, Linux, BSD).
Please comment with suggestions!
Haiku - http://www.haiku-os.org
An open source reimplementation and continuation of BeOS.
React OS - https://reactos.org/
Open source clone of Windows.
Morph OS - https://www.morphos-team.net/
Replacement for AmigaOS (non-x86 only)
Visopsys - https://visopsys.org/
1 man hobby OS with GUI.
AROS / Icaros Desktop - http://aros.sourceforge.net/ / http://www.icarosdesktop.org/
AmigaOS inspired but runs on x86.
Menuet OS - http://menuetos.net/
Completely written in assembly. Only the 32bit version (discontinued) is completely open source.
Kolibri OS - https://kolibrios.org/en/
Completely written in assembly. Forked from Menuet in 2004.
Discontinued
Dex OS - http://dex-os.github.io/
Syllable - http://www.syllable.org/
SkyOS - https://en.wikipedia.org/wiki/SkyOS
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