I have a Power Macintosh 6100 (one of the first PPC Macs) and a 1.0GHz PowerBook G4 (Titanium) on hand that I use just sometimes. They're currently mostly idle -- the G4 needs a new hard disk and maybe a battery, and the 6100 could use a PRAM battery. Both need access to a netatalk server (on which I'll also run samba) so I can share data between them and my more modern machines.
One day,when I have some more space, I'll pull out my Quadra 840av and my LaserWriter 360 Select as well.
It's really interesting to see the number of posts here that talk about PowerPC as though staying the PPC course is an ideological posiiton that's important to prove a point.
Just out of curiosity, to whom are you proving the point? It seems like doing this is really just tightening the noose around your own ability to get things done in a reasonable manner, such as PowerMac G4 MDD's posting about stalling while opening collaborative documents online, here:
https://forums.macrumors.com/posts/20553347/
Kind of tangentially, while most of my computers are Intel-based, my main portable computer at this point is a Microsoft Surface RT. I like it for a few different reasons, most of which revolve around the iPad-like battery life, and its ability to run most of the Microsoft Office suite fairly well. I was also admittedly curious at what Microsoft's second major push toward Windows on non-Intel platforms would look like.
What's interesting is that while it more or less "still meets my needs" (runs Word and OneNote fast enough) -- computing as a whole has absolutely moved beyond it, and today there are plenty of less expensive devices that'll do more, better, and faster. The main reason I haven't replace it, in light of that, is because it also still gets security updates. In the style of AppleWorks 5 or WordPerfect 3.5 on my Power Mac 6100, it's as good at running Word 2013 today as it was two years ago. I'm just fortunate in that most of the time, I don't need to do a whole lot on the web with this system, because that's definitely its weak point.