The online racing simulator
Wide Area Network Emulator, for testing packet quirkiness.
WANEM: The Wide Area Network Emulator. WANem allows the application development team to setup a transparent application gateway which can be used to simulate WAN characteristics like Network delay, Packet loss, Packet corruption, Disconnections, Packet re-ordering, Jitter, etc.

I've just found this project today, about 10 minutes ago, and was thinking that this could be useful for other InSim devs out there to check their code against to see how robust their network code is within a lab environment that can simulate the quirky WAN characteristics can may only be found on the fringe.