Known Simulators

Mobiwan

The NS-2 MOBIWAN package (ns-2.1b6 only, Mobile IPv6 draft-14

MobiWan is a simulation tool based on NS (version ns-2.1b6) meant to simulate Mobile IPv6 under large Wide-Area Networks (both local-area mobility and global-area mobility). As such, MobiWan comprises extensions to simulate Mobile IPv6, and extensions to manipulate and configure large network topologies (TOPOMAN / TOPOGEN). Both extensions can work independently one from the other.

http://www.inrialpes.fr/planete/pub/mobiwan/  
Notes: not maintained but the author, but numerous people have extended it. No information available about potential releases.

SimulX

The aim of this simulator is to validate current and new protocol. This simulator is a stand alone simulator developped in C++ and gtk. The main features are the support of 802.11 and IP mobility (e.g. Mobile IPv6, NEMO, Fast Handovers).
http://clarinet.u-strasbg.fr/ montavont/SimulX/SimulX.html

NAB Simulator

http://nab.epfl.ch

Local copy: simulor-nab-0404.txt

OMNET++

OMNet++ http://www.omnetpp.org/

IPv6 suite for OMNet++
http://ctieware.eng.monash.edu.au/twiki/bin/view/Simulation/WebHome