Lithium is an RAD framework for PHP 5.3+
Lithium, an RAD framework for PHP, is focused on quality, speed, and flexibility. It's a set of philosophies and tools that enable one to build applications quickly, without sacrificing quality, extensibility, or control of the framework.
Lithium understands distributed storage and caching, queuing systems, micro-dispatch frameworks, with integrated support for document oriented databases like CouchDB and MongoDB, alongside relational databases like MySQL and SQLite.