Yellow Dog
I actually ran this on a PPC Mac back in the day
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Yellow Dog
I actually ran this on a PPC Mac back in the day
Someone gave me a PowerMac and of course I had to try to run Linux. It was an interesting experience, it would boot to MacOS and then run the Yellow Dog bootloader. Couldn't get it to boot directly. That little experiment showed me how tightly Apple controlled what would run on Apple machines back then.
That was the my first distro. Getting it to run off a FireWire drive was an interesting introduction to Linux.
Fun fact: yum stands for Yellow dog Update Manager. I know it's been replaced by dnf but I still think that's cool.
Jolicloud. I ran it on an old low-spec netbook in 2013ish, basically a ChromeOS before Chromebooks were a thing. It was discontinued in 2016 but great for the hardware while it lasted.
The old PearOS(which looked like a meme-ish knockoff MacOS), UwUntu and Nyarch
I haven't tried all that many distros, but I'd say Puppy Linux. Pretty neat that it loads into RAM from USB and has fairly light memory requirements, but it does feel a little on the clunky side as far as configuration and stuff goes.
I imagine there was a time when this wasn't obscure, but I'm guessing people today don't remember Caldera OpenLinux. That was the first Linux distro I installed/used. A guy from church gave his copy.
Caldera eventually became SCO. But I'm pretty sure I was using Caldera OpenLinux before the whole Novell patent suit thing.
Obscure as in "only for a very specific purpose and nothing else"?...
Well, there is the Mircrosoft linux distro for their azure cloud
I guess DD-WRT as distro for router is also kind of obscure. Or the more general openWRT for embedded systems.
Linux STD! Waaaay before skiddos had backtrack or kali
I created a distro once for class that just had diaspora installed on a live CD. It was only used for demos a looong time ago. DiasporaTest.
Probably KaOS. It puts a strong focus on KDE and Qt.
As in, it doesn't package programs using different GUI toolkits, aside from the most popular, like Firefox and GIMP. When I tried it a few years ago, you also had to enable a separate repo to get access to these.
Reminds me of chakra linux. Same principals, except built on top of Arch base, and the other toolkit apps were distributed as self contained image files.
I had no idea mageia existed until I met a dude who had it
Clear Linux.
Windows 11
Not obscure but I love hyprland
Also not a distro.