Nibble Framework is a plug-in based framework that enables fast development of small to medium Web sites. It is designed using PHP 5.3 functionality such as namespaces. Web sites and applications are developed using collections of plug-ins that can be reused and shared with other developers. Plug-ins can be installed using a drag and drop interface. Many classes are provided, including the Nibble Forms class, Twitter feeds class, and RedBean PHP ORM.
PIMF (Php Is My Framework) is a micro framework for PHP that emphasises minimalism and simplicity. It is based on proven design patterns and a fast object relational mapping mechanism, and is designed to be easily updated without having to rewrite your projects. It includes mechanisms for easily coupling controllers to ExtJs and Dojo.
Guzzle is a RESTful Web service client framework that enables PHP developers to quickly build testable Web service clients utilizing HTTP/1.1 best practices. It gives you access to advanced features like persistent HTTP connections, parallel requests, exponential backoff, over the wire logging, MD5 validation, cookie jars, and a caching forward proxy.