Wallaroo is a dependency injection library for C++. With wallaroo you can easily separate the object graph from the class implementation. You can create objects and wiring them using strings, so that you can load the "object graph" from a configuration file.
JAST (Javascript Toolkit) is an Open Source cross-platform javascript framework that aid users to perform the most hard operations with few simple lines of code.
It's modularity allow the download only for the code required to the page.