For an individual, I used to use WikidPad and quite like it. Source: about 1 year ago

There also are "serverless" wikis, like http://tiddlywiki.com/ (can be run as a standalone desktop app - see in the bottom, or Wiki on a Stick, or WikiPad. Source: about 1 year ago

Wikidpad is quite functional. It's not the prettiest but it does its job. I don't know if or how you can implement images. But it's free and maybe worth a try. Source: over 1 year ago

Is it this one? http://wikidpad.sourceforge.net/ Also is it on mobile, and does it support images? Source: almost 2 years ago

If your work is not published its very likely to be removed by a mod on Wikipedia, but when it comes to organizing your world, a personal wiki is by far the best way to do so. There are lots of tools out there, both free and premium. I would recommend doing some research on all of the suggestions in this thread and find what works for you. Wikidpad is a free desktop wiki that's super handy when you just want to... Source: almost 2 years ago

+1 on the need for non-Spotlight options. Source code makes a mess of spotlight for everyday usage. I like Leap a lot for multimedia browsing with more precise search capabilities than spotlight: https://ironicsoftware.com/leap/. - Source: Hacker News / 6 months ago

Just use tags for everything and don’t worry that much about the file hierarchy. This will let you take advantage of automatic downloading systems like the apps that DriveThruRPG and itch provide. Point Leap at your collection and use it to find stuff. Source: over 1 year ago

You might also look into Leap for tracking/tagging stuff. Source: over 1 year ago