Phire CMS : Open Source Content Management System
Development : API Docs
For those that want a more in-depth look at the Phire CMS API, the API docs are available here.
Also, the API docs for the PHP library that Phire is built on, the Moc10 PHP Library, are available here.
And, you can get more information on the JavaScript library used to enhance the UI of Phire at the Jax JavaScript Library website.