Ever had the need to document something complex where a simple text file would not fit the bill but a server-based Wiki would be overkill? Look no further, there is TiddlyWiki.

There's not much more to say about TiddlyWiki than the blurb on the website:

It's written in HTML, CSS and JavaScript to run on any modern browser without needing any server side logic. It allows anyone to create personal self-contained hypertext documents that can be posted to a web server, sent by email or kept on a USB thumb drive to make a Wiki-on-a-Stick.