Kupu
The Kupu repository has been relocated to:
http://svn.plone.org/svn/collective/kupu/
If you're looking for an earlier release for Plone you'll probably find it here:
http://plone.org/products/kupu/
What is Kupu?
Kupu is a ‘document-centric’ open source client-side editor for Mozilla, Netscape and Internet Explorer. Inspired by Maik Jablonski's Epoz editor, it was written by Paul Everitt, Guido Wesdorp and Philipp von Weitershausen (and several other contributors, for a complete list refer to the CREDITS.txt file) to improve the JavaScript code and architecture, pluggability, standards support, support for other webservers than Zope (which was the original target platform), configurability and a lot of other issues.