ZuluPad - ZuluPad is a notepad on crack.
TiddlyWiki - a non-linear personal web notebook
Fandom - The entertainment site where fans come first.
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.
TiddlyDesktop - TiddlyDesktop is a special purpose web browser for working with locally stored TiddlyWikis.
Wiki on a Stick - Self-contained desktop wiki