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A large number of peer-to-peer (p2p) systems have been developed in recent years. Many of these new approaches to p2p networks have been developed in parallel with a simulator of one sort or another. Other authors have already started to call for standardization in the area of p2p simulation (Schlosser et al., 2002), and this paper supports that call. It also goes further to suggest that an extendible open source simulator is required. This paper also tries to summarize some of the desirable features of a p2p simulator by looking at the different existing simulators. We then present the NeuroGrid simulator, an extendible open source p2p simulator, and outline a number of ongoing projects that have been implemented by extending from this architectural base.