A Girl Called "Cat"

Its a Web page with intelligence. For over a decade TW has been evolving. It can be used straight out of the box (https://tiddlywiki.com) to start. Immensely flexible using its own macro language to expand function in any way you want. Very good support (via https://groups.google.com/forum/?pli=1#!forum/tiddlywiki). It is more than a wiki. It's more like a self-contained development environment.

Practical for getting things done. Very good backwards compatibility despite evolving constantly. It is way more than a wiki. Customization of functions is very open & easy. Can be used well by folk not familiar with Javascript. Ideal for developing custom Web page apps.