- Wiki’s are often used to build digital gardens or commonplace book.
- Wiki’s can be used as a knowledge base or instruction manual.
- You could use a wiki to make a directory that is less hierarchical than a traditional directory.
- You could use a wiki to make a local guide or a local tourist guide or travel guide or bike/hike trail guide.
- Wiki would work for a local restaurant review site.
- Recipe site.
- Product review site.
- Memoir – so many of our memories are incident by incident. You could use a wiki as sort of a non-linear memoir. (A zettelkasten would also work.)
Add other ideas.
Stand alone wiki scripts:
I only have a little experience with 2: Doku wiki and Media Wiki. For a wiki by an individual I think Doku is a better choice, because Doku uses a flat file database which will be way more durable over the long run.
MediaWiki (used by Wikipedia and Indieweb.org) can scale very large. Good for a membership editied wiki, but most individuals do not need that kinda scale.
Plugins for WordPress.
There are many wiki plugins for *Press. If you are already using WordPress/ClassicPress (*Press) then adding a wiki plugin might be the easiest way to establish a wiki as opposed to installing a stand alone script.
Yada Wiki is the plugin that always catches my eye, although I have no experience with it.