REDS (REconfigurable Dispatching System) is a framework of Java classes to build publish-subscribe applications for large, dynamic networks. Distributed publish-subscribe applications are organized as a collection of components, which interact by publishing messages and by subscribing to the classes of messages they are interested in. REDS provides the client API to write publish-subscribe applications and defines a general framework of components, with clearly defined interfaces, to build a distributed dispatcher organized as a set of brokers linked in an overlay dispatching network, which collaborate to route messages from publishers to subscribers.