Wiki on a Stick - Self-contained desktop wiki
ZuluPad - ZuluPad is a notepad on crack.
Woas - Complete wiki in a single HTML file, forked from Wiki on a Stick.
Fandom - The entertainment site where fans come first.
TiddlyWiki - a non-linear personal web notebook
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.