MkLinux?

https://www.mklinux.org/

I seem to recall Ubuntu Mate being the OS of choice for PowerPC users back in the day, but I lost track of what they all switched to when Ubuntu dropped 32-bit architecture.

I'd say that Yellow Dog Linux was the most influential of the PowerPC distros. I ran it for years on my first generation Mac Mini.

YUM, the package manager used until recently on RedHat/Fedora, was based on Yellow Dog's YUP:

[Y]ellow Dog [UP]dater -> [Y]ellow Dog [U]pdater, [M]odified

https://en.wikipedia.org/wiki/Yellow_Dog_Linux