Alternatives to Windows and Mac OS's

Tired of big tech OS computing? Here are some alternatives.

*Linux (and many different distro's)
*Freebsd (and derivatives)
*Unix (and derivatives)
*ArcaOS (modern day PS/2)
*ReactOS

When it comes to tablets and cell phones, I am not too sure of any viable alternatives. But I hope people get adventurous like I did -- don't be a slave to big tech!