TWiki 4.0 (code named Dakar Release) adds a WYSIWYG editor (beta), an enhanced security model, a REST interface, much simpler install and configuration, integrated session support, and a localization framework, localized to Chinese, Danish, Dutch, French, German, Portugese, and Spanish.
TWiki is a flexible, powerful, and easy to use enterprise collaboration platform. It is a Structured Wiki, typically used to run a project development space, a document management system, a knowledge base, or any other groupware tool, on an intranet or on the internet. Web content can be created collaboratively by using just a browser. Users without programming skills can create web applications. Developers can extend the functionality of TWiki with Plugins.
TWiki 4.0 can be downloaded from http://twiki.org/download.html
See press release at