TiddlyWiki - a non-linear personal web notebook
ZuluPad - ZuluPad is a notepad on crack.
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.
Fandom - The entertainment site where fans come first.
ConnectedText - ConnectedText is a powerful but simple information management system.
LionWiki - LionWiki is a minimalist Wiki engine programmed in PHP.