Textpattern

Textpattern is an open source blog application. Textpattern was initially released in 2003.

Textpattern is an elegant content management system. Web designers, developers, publishers and bloggers love Textpattern's flexibility and extensibility. Textpattern has a powerful, sophisticated engine that can be infinitely tuned to suit whatever type of web site you can imagine.

Features:

Direct, easy to follow interface
Standards compliant
Browser-based organization and upload of files and images
Articles can be protected with a password
Unlimited site sections, categories, page layouts and styling
Browser-based template and CSS editing
Anti-spam comment system
Unlimited site authors can be assigned a variety of posting, editing and design privileges
Human-readable clean URLs help SEO and visitors
Up-to-the-minute visitor logs
Wide range of plugins enable additional features