TiddlyWiki
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The name “TiddlyWiki” is very non-descriptive, so I’ll save you the trouble of wondering about it any further. TiddlyWiki is a reusable notepad that edits like a wiki website, meaning that content can be added to it from within the browser that you are viewing it from.
TiddlyWiki likens itself with Google Notes. The only reason I’d prefer Google Notes is the fact that you can access your Google Notes from anywhere with an internet connection.
It consists of a single .html file which you access from within your browser, allowing you to edit it on the fly. You can post it on the web for other people to see but they won’t be able to edit it. The javascript that TiddlyWiki utilises requires the file to be opened on the local computer before it is editable. I found minitiddlyserver which allows you to edit and save your tiddlywiki to an online location. All you need is hosted webspace with access to PHP 5.1 or greater.
TiddlyWiki becomes very useful when used in conjunction with the tiddlysnip FireFox add on, allowing you to add selected text to your wiki at the right-click of a button.

