Hello Fredmj,
We don't have an unofficial port repositories list for CRUX-PPC{32,64}, as none ever submitted us any port, nor anyone ever showed interest in being able to commit in the "official" repositories.
I will do a wiki page in the next days to document the
ports hunting procedure and/or to maintain a list of resources (that i suppose will be empty for now).
We use to commit in our opt repository the improved/adjusted/updated version of some particularly interesting or important ports taken from the CRUX contrib or unofficial repositories (they will have priority due to Ilenia's port's hierarchy).
But don't be desperate, the good news is that, as CRUX and CRUX-PPC are source based distributions, most of the ports you will find in the contrib or unofficial port repositories of CRUX will also work on CRUX-PPC and CRUX-PPC64; in most cases you will find footprint mismatches (an upcoming improved version of the port drivers might fix some of those circumstances), in less frequent cases you might have to do some adjustments to the port... then it will be great if you'd share them with us publishing your personal repository. Unfortunately the x86 binary ports (like google chrome or opera) will install but won't work.
So I suggest You to use your CRUX-PPC64 as if it were a normal CRUX (and all in all it really is a "normal" CRUX ;)): only add the repositories you find more useful so your sistem will keep clean and tidy; just download and compile in a separate local ports directory the single ports that you need or find interesting but that are in a repository that you're not willing to be handled by your ports system. Use the CRUX's sit
http://crux.nu/portdb/ page to find them. And in that local ports directory you can also put the ports you wrote yourself (i.e. prt-utils might help you to write them). When you'll have some of your own ports you can publish them in a repository ;)
I must confess i have a small collection of personal ports, there is nothing really PowerPC specific in them, so i didn't publish them yet, but i will someday.
Hope this helps, anyway keep in mind that CRUX-PPC is a CRUX system, so in most cases it simply behaves like a CRUX, and the CRUX documentation perfectly applies to CRUX-PPC too. The only specific things are due to the PowerPC architecture and to the use of our tool Ilenia, that you can use instead of, or in conjunction with the official CRUX's prt-get.
have fun ;)