OMNeT++ is an extensible, modular, component-based C++ simulation library and framework, primarily for building network simulators.
IP Micromobility Suite
IP micromobility suite at Mobile Computing Laboratory, Budapest University of Technology and Economics. Source code is available from the site. The models are used in both research and teaching. Home page: http://www.mcl.hu/~brozsas
Border Pricing Protocol
Border Pricing Protocol model of Vincent Oberle. BPP is a proposed protocol for the spreading of price information over the Internet. http://www.oberle.org/bpp.html