Nucleus CMS
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 lightweight content management system.
Nucleus makes use of a callback function which has led to a plugin system that has inspired over 300 distinct plugins in multiple languages. 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.
Nucleus is available through a number of "easy install" services such as Fantastico, Installatron, and Simple Scripts.
Features
Nucleus CMS features a range of features which can be extended further by plugins some of which ship as standard. Some new skinvars were recently added.
Multiple Blogs
Multiple Authors
Categories
Commenting system: Nucleus provides a built-in Commenting System. This can be extended with tools such as ModComments or ReCaptcha.