Some Java classes which are integrated in the sourcecode of plugins which want to use QuarterBukkit.

The runtime bytecode manipulator in form of a java agent that implements some framework features by injecting code into tree classes.

The annotation processor which is used to index all tree classes.

JTimber is a framework that supports the creation of complex Java object trees by introducing concepts like object parent storage.

FemtoWeb is an extremely minimalistic non-intrusive action based Java web framework.

Classmod is a library for creating classes which can be modified at runtime.