Open Source CMS with Custom Fields & API: ProcessWire CMS/CMF
With all custom fields, an easy-to-use jQuery-inspired API, and a powerful selector engine, ProcessWire will rise to any task. ProcessWire is a free PHP5 content management system and framework (open source CMS/CMF) built to save you time and work the way you do. Stop trying to bend other open source CMS platforms to your will …

