Sled is a very lean, schema-driven web framework and CMS developed by me in PHP. It was initially created to allow the development of complex custom websites and web applications at Buzzbar in an accessible way. While Sled is very simple to configure and use, it is currently powering several websites with complex requirements such as multiple domains, currencies, payment gateways, region sand languages. An incomplete documentation can be found here.
The Sled CMS backend interface is generated from JSON schema files that describe simple or complex data types and the frontend editor is based on the ability to create reusable, self-contained, data-driven components. Data is stored in the file system, therefore the system does not require a database and together with a simple caching system allows for a very performant and scalable solution for websites and web applications.