TiddlyWiki5 is a complete rewrite of the original TiddlyWiki, incorporating many of the improvements that I've wanted to make over the years. It is now based on an elegant [[microkernel architecture|PluginMechanism]], that allows infinite customisation by replacing and augmenting the core modules. The new code is much easier to work with, and will hopefully prove an even more fertile ground for the community of open source developers around TiddlyWiki.
* TiddlyWiki5 can directly build both itself and previous (2.6.x) versions of TiddlyWiki from their constituent separate files, without needing external tools
The internal changes mean that TiddlyWiki5 is not compatible with previous versions, using different plugins, themes and so on. The changes to the WikiText have been carefully developed to try to maximise backwards compatibility but content prepared for previous versions of TiddlyWiki will need massaging to work properly in TiddlyWiki5.