Summary. The notion of complex systems is common to many
		domains, from Biology to Economy, Computer Science, Physics, etc.
		Often, these systems are made of sets of entities moving in an evolving
		environment. One of their major charac- teristics is the emergence of
		some global properties stemmed from local interactions between the
		entities themselves and between the entities and the environment. The
		structure of these systems as sets of interacting entities leads
		researchers to model them as graphs. However, their understanding
		requires most often to consider the dynamics of their evolution. It is
		indeed not relevant to study some properties out of any temporal
		consideration. Thus, dynamic graphs seem to be a very suitable model
		for investigating the emergence and the conservation of some
		properties. GraphStream is a Java-based library whose main purpose is
		to help researchers and developers in their daily tasks of dynamic
		problem modeling and of classical graph management tasks: creation,
		processing, display, etc. It may also be used, and is indeed already
		used, for teaching purpose. GraphStream relies on an event-based engine
		allowing several event sources. Events may be included in the core of
		the application, read from a file or received from an event handler.