Wordpress

WordPress is a blog tool and publishing platform. Simple dashboard to add/edit/delete posts and pages.

Blogger

Blogger.com This is the best free blogging system available in my opinion. Blogs are hosted on blogspot.com or blogger.com free of charge.

Sweetcron

SweetCron is an automated lifestream blog software. Automatically posts feeds to your blog via external accounts such as Twitter.com, flickr.com, Hulu.com, Last.fm and many more social networking sites. Demo site is www.yongfook.com.

sNews

sNews is a completely free, standards compliant, PHP and MySQL driven Content Management System. sNews is extremely lightweight, simple and customizable. It’’s easy to install, and easy to use via a simple web interface. sNews consists of only one core engine file, one independent template file and its accompanying CSS stylesheet file, plus an .htaccess file that makes all URLs search engine friendly.