TiddlyWiki is a free browser-based, reusable, non-linear personal notebook.
TiddlyWiki is a single html file which has all the characteristics of a wiki
- including all of the content, the functionality (including editing, saving,
tagging and searching) and the style sheet. Because it's a single file, it's
very portable - you can email it, put it on a web server or share it via a
USB stick. (in Internet)