Serendipity

Serendipity, also known as s9y, is an open source PHP blog engine built around the Smarty templating system. It provides a customizable and extensible foundation for creating and managing a blog. Its structure separates the blog engine from its templates, making it possible to adapt the appearance and setup of a blog while retaining the flexibility to expand the engine. Serendipity is intended for people who want to build or manage a blog and who value the ability to customize templates or extend the underlying engine. It can serve as an alternative to paid WordPress.com plans. One important difference is its technical foundation: Serendipity is a PHP engine centered on Smarty templates, so it is most appropriate for a blogging setup that can use those technologies rather than for someone seeking the same product and system as WordPress.com.