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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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I run FreeBSD with dwm on an old Dell Inspiron 8200 laptop from 2001 sporting ~700 mb of memory, so I'm glad to see FreeBSD made it onto your list!
For those thinking, isn't reviving one of these for daily use just an exercise in masochism? Yes, yes it is. However, despite the limited memory, the GUI is still snappy most of the time! I can even run qutebrowser to visit the horrid modern web, though graphical links stands out as a better choice for most simple web needs.
I would add ratpoison to the list of Window Managers (though I guess any simple c based Window Managers will work). It has no fat library dependencies, no fancy graphics and no window decorations.
It has a totally different experience then those other WMs, being prefix key based and manual tiling.
All are great choices even for modern computers.
void linux is severely underrated, so thanks for putting it in there! also gentoo is good if you put the time into it.