Traffic generators and Packet generators

Hi
I am searching for user level standalone traffic generators and packet
generators for windows and linux both. I tried hping but it is not
giving much higher rate. There exists several ones like D-ITG or so
but I need a tool which doesnt require the receiver part. Can any one
guide me. For windows; I am currently using TFGen but it is a not
packet generator rather using the utilization factor in bps.

Thanks


Asif