website VS awesome

You can use Rufus: https://rufus.ie/en/

To modify the ISO to turn off hardware check and TPM support for Windows 11 to install it on an unsupported PC.

https://github.com/pbatard/rufus/wiki/FAQ#user-content-Help_...

Besides Linux and BSD Unix there is: https://reactos.org/ https://aros.sourceforge.io/ https://www.haiku-os.org/ and https://www.arcanoae.com/arcaos/

I know some third-world nations still use DOS and the BORLAND DOS compilers because people donate old computers to their nations.

With the right OS, old computers are still usable. Please don't throw them away, e-cycle them so they get used by poor nations that cannot afford new PCs.

If interested, please take a look at its up-to-date evolution

https://www.haiku-os.org

I tested on real hardware too, and it worked well

Have you checked out Haiku? It's so delightfully early 2000s.

Bro you clearly haven't use HaikuOS before.

Try this list https://github.com/firasuke/awesome

Stuff like Business Card Linux might be worth a look. There's some useful links here

Other projects that could be worth a look are Kiss, Crux, Exherbo & Void...there's a few other pointers in this list.

Gentoo's quite a complex beast, you could look at simpler stuff with code a single human has a chance of understanding. mkroot, Kiss, Glaucus, Sta.li, few more here

If you are interested in the nuts an bolts of operating systems there's a nice list of interesting projects here.

https://github.com/firasuke/awesome (last updated yesterday)

If you search on this link there are a few attempts to use the linux kernel with a bsd userland.

Glaucus is another one man project, his Github site has a lot of good info and links to other awesome projects