Wikis are wonderful, but nowadays hosting and security can be a problem. There are wikis that work as a native app on your computer, but they export to the web poorly if at all. With the right skills you can handcraft web pages; it's easy and fun, but gets tedious after a while.
Enter AntiWiki: a text editor that lets you create wikis made of as many pages as you want, and export them as a website with a common layout, navigation and so on. You can upload the result to any web host, or open it in your browser straight from disk.
AntiWiki is very small and light; it's also very simple, and won't hold your hand much.