Nucleus
The Content Management System in Brief:
CMS Original Developer: The Nucleus Group
Operation System: PHP compatible
Main Use: Blog software
License: GNU General Public License
Developers' Description:
With Nucleus, you can set up one or more weblogs. If you want to, you can even show the contents of multiple weblogs on the same page.
Each blog has its own team of authors. Some authors will only have posting rights, others will be allowed to change settings for the blog as well.
Within a weblog, you can set up one or more categories. Each item you add in your weblog will be put in one of these categories.
Nucleus provides a built-in Commenting System, so there's no need for external commenting tools.
A karma-voting system is also provided.
Vox Populi (taken from Wikipedia):
Nucleus CMS is an open-source blog management software package written in PHP, with a MySQL backend, primarily written and maintained by Wouter Demuynck. It is used to manage frequently-updated Web content. With a little tweaking (mainly to skins) it might be considered a light content management system, although there is no facility to upload file types other than graphic files to be displayed within the blog pages.
Nucleus makes use of a callback function which has led to a plugin system that has inspired somewhere in the order of 50 to 100 distinct plugins. The general drive within the development community is that functionality should exist as plugins as totally as possible. This philosophy has led to a relatively light and uncluttered base install.