Wiki on a Stick - Self-contained desktop wiki
TiddlyWiki - a non-linear personal web notebook
Woas - Complete wiki in a single HTML file, forked from Wiki on a Stick.
Scribbleton - The little personal wiki.
Banana Dance Wiki/CMS - Free open source software combining the best of wiki and CMS with community building-features.
Zim Wiki - Zim is a graphical text editor used to maintain a collection of wiki pages. Each page can contain links to other pages, simple formatting and images.