ConnectedText - ConnectedText is a powerful but simple information management system.
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.
TiddlyWiki - a non-linear personal web notebook
VoodooPad - VoodooPad is a personal wiki developed for the Mac OS. It lets users create a personal wiki by giving them the ability to manage a network of pages right from the desktop.
Ultra Recall - "Ultra Recall is personal information, knowledge, and document organizer software for...
wikidPad - wikidPad is an application for storing thoughts, ideas, todo lists, contacts, or anything else that user can think of to write down.