Netsim 6

Boson Netsim for CCNP 6.x
screenshot | size: 29.3 MB | price: $249.95 | date: 10/5/2004
Create a simulated virtual Cisco Network with Boson's newest network simulator, also aimed to prep those for CCNP certification.
NetSim 2.0
screenshot | size: 9.72 MB | price: $1500 | date: 1/22/2007
Educational network simulator. Simulation of LAN / WAN protocols. Network programming, real time and Animated Basics
Boson Router Simulator 5.x
screenshot | size: 37.7 MB | price: $249.95 | date: 8/26/2004
Boson Netsim for CCNA