Serendipity

Serendipity is an open source blog application. Serendipity was initially released in 2005.

Serendipity is a PHP-powered weblog application which provides website owners with an easy way to maintain an online diary, weblog or even a complete homepage. While the default package is designed for the casual blogger, Serendipity offers a flexible, expandable and easy-to-use framework with the power for professional applications.

Serendipity's basic features include something for everybody, from the personal blogger to the professional corporate web designer:

WYSIWYG and HTML editing
Built-in, powerful media database
Multiple authors, configurable permission/usergroup system
Threaded comments, nested categories, post to multiple categories
Online plugin and template repository for easy plug-and-play installation
Cool plugins: category-based sub-blogs, podcasting, RSS planet/aggregator, static pages
Robust spam blocking
Can be embedded into your existing web pages
Standards-compliant templating through Smarty, remote blogging via XML-RPC
BSD-style licensing
Shared installations can power multiple blogs from just one codebase
Native import from earlier blog applications (WordPress, Textpattern, Moveable Type, bblog)