Nucleus CMS is a flexible and easy to install content management system, aka blog software. It helps you to publish a website and lets writers do what they are best at: writing items or articles, without having to worry about formatting and markup. Nucleus is released under the GNU/GPL license.
Version : 3.65
Nucleus Core package has a great set of features.
Maintenance of one or more weblogs/news-sites
Multiple Authors
Categories
Built-in commenting system
FancyURLs
Runs on your own server
Drafts and Future Posts
Fully Tweakable
Plugins
Bookmarklet and right-click blogging
Archives and Search
RSS and Atom Syndication
XML-RPC interface: Blogger, metaWeblog and MovableType APIs