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Netsim is a mobile ad hoc network simulator targeted at large heterogeneous node configurations. It is written in Java and is easily extensible through its modular concept.
bns is a network simulator.
You can create a complete network, add services to host, ... It can be usefull to study network behavior, make presentations, learn hacking techniques, ...
JNS is a Java version of the ns-2 network simulator originally from Berkeley.
It allows developers of routing and other network protocols to simulate their protocols under various conditions.