Co-founder of pleeq.com and all related projects.
Recently, I develop engine on PHP for our blog platform Macilove.com, the project is closed now, but you can use developed engine, it's on github.
It's poorly documented, at least right now, but it can be solid foundation for your projects. It's consists of: catalog page, article page, editor page, including all css, html and php files. It have much more undocumented functions.