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.
wikidPad - wikidPad is an application for storing thoughts, ideas, todo lists, contacts, or anything else that user can think of to write down.
Scribbleton - The little personal wiki.
Knowledge Workshop - Learning Management Solutions provides innovative and reliable software for the knowledge worker.
MyInfo - MyInfo is the most versatile organizer for Windows