Note: An alternative skin, TW4MW (work in progress), is available from the user preferences.

TiddlyWiki Community Wiki

All you need to run TiddlyWiki is your web browser. Though it must be a reasonably recent browser that supports javascript. Firefox is reported to have the best support, but IE (6 or better), Opera, and Safari are also supported.

If you want to publish your TiddlyWiki then you'll need a web host (or a hosting service like the free http://www.tiddlyspot.com).