Foo Framework is a Javascript Framework, built on top of the Prototype Framework, specially designed to ease the development of Rich Internet Application. Foo acts as a virtual machine that translates Foo markups to javascript dynamically and chains it to your data to create a highly responsive Web Application. It combines the ease of html and the power of javascript to make it very easy to create very complex applications without forcing you to use all-in-one GUI sets. Foo is very modular. It includes a Developer API that allows you to create custom markups and modules as you need without having to modify the core engine. So it increases your productivity, since you don’t need to hacks the code to make it behave as you wish. All you have to do is create a custom plugin.