From Seo Wiki - Search Engine Optimization and Programming Languages
TiddlyWiki is published by UnaMesa – a non-profit association – under a BSD open source license and is thus freely available. Developer Jeremy Ruston describes it as experimental, and in that spirit many people have used the original HTML file to create TiddlyWiki Adaptations. These fall under two general categories: those that retain the client-side write only feature, and those that add server-side file writing to make TiddlyWiki more like a traditional wiki. Links to both these kinds of Adaptations are put in the original TiddlyWiki file as they become known. TiddlyWiki Adaptations typically add features that were not originally envisioned by Ruston, and some of these features have been included in newer versions of TiddlyWiki.
A feature that sets TiddlyWiki apart from a standard wiki implementation is its content presentation. Jeremy Ruston had this to say about it:
A TiddlyWiki is like a blog because it's divided up into neat little chunks (tiddlers), but it encourages you to read it by hyperlinking rather than sequentially: if you like, a non-linear blog analogue that binds the individual microcontent items into a cohesive whole. I think that TiddlyWiki represents a novel medium for writing, and will promote its own distinctive writing style.