Looking for a lightweight wiki that is easy to install and use? You might want to give LionWiki a try. The core version of this lightweight wiki engine consists of a single PHP file, so you can deploy a bare-bones wiki by simply copying the PHP file to your server. The core version of LionWiki sports essential features like page history, changes tracking, pages renaming, and password protection.

For more functionality, go for a full version of LionWiki which sports a handful of handy features and plugins. The bundled plugins add several useful features, including support for comments (and captcha for preventing comment spam), footnotes, tables, tags, and RSS feeds. All plugins are enabled by default, and embedding their features into wiki pages is as easy as it gets. For example, to add tags to the currently edited page, insert the {tags:tag1, tag2, tag2} line into the page.

LionWiki also provides support for themes, and there are a few themes available on the Appearance page of the project's website. The wiki engine uses simple formatting syntax which supports all key text formatting options including headings, ordered and unordered lists, various text styles (bold, italic, underlined, etc.), links, and images. You can even add a table of contents to a page by inserting the {TOC} tag into the page. In short, if you are in the market for a no-frills wiki for personal use, LionWiki fits the bill quite nicely.