There are a lot of Linux distributions that can run on PPC Processors.
I have experienced using Debian 4.0 Etch on a '99 G3 iBook and it was simply great !
You can try Debian if you want, or try something "harder" like Gentoo or a BSD distribution. (OpenBSD works fine on my iBook and my '00 G3 PowerBook)
There are a lot of Linux distributions that can run on PPC Processors.
I have experienced using Debian 4.0 Etch on a '99 G3 iBook and it was simply great !
You can try Debian if you want, or try something "harder" like Gentoo or a BSD distribution. (OpenBSD works fine on my iBook and my '00 G3 PowerBook)