ConnectedText - ConnectedText is a powerful but simple information management system.
DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
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.
Pepperminty Wiki - An entire wiki in a single PHP file. Intended for small - medium sized wikis.
Ultra Recall - "Ultra Recall is personal information, knowledge, and document organizer software for...