I'm Sam Kleinman (tychoish), and I use ikiwiki.
I used to use ikiwiki a bunch, in a purely local setup, for various projects and personal note taking of various kinds. I've since switched to using orgmode and a number of just regular old git repositories with some textfiles in them, which seems to work just as well for my particular use case.
Currently, I'm using ikiwiki on the cyborg institute wiki and I'm working on helping someone develop a collaborative fiction project at the critical futures wiki... and I'm thinking about other projects, but nothing that exists enough to mention here.
I hang out in #ikiwiki on oftc, and I'm working on getting some of my templates in order to share with you all. Soon. For sure.