PJWiki is a Java-based desktop wiki application that stores its data to plain text files. It supports (and encourages) multiple users via a shared file system. The syntax is loosely based on that of the DokuWiki project and is currently "parsed" with heavy use of regex, something I hope to replace with a legitimate parser one of these days. I originally wrote something very similar to this in C# and WinForms but wanted something a bit more cross-platform and better laid out (the original app could best be described as a hack).

At this point, it's far from complete but the basic syntax parsing is in place and I'm working on making it a fully functional application as time permits.