Limb is an OpenSource(LGPL) PHP framework mostly aimed for rapid web application prototyping and development. The current actively developed branch of framework is Limb3(there is also Limb2 but it's not maintained anymore).
Limb3 is not a monolithic framework, it's rather a library which consists of many reusable components distributed as packages on Limb3 PEAR channel. Thus you can cherry pick the components you need and combine them with other frameworks and libraries(e.g. ZendFramework, Symfony, PEAR, etc).
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