Traffic generators

1)D-ITG http://www.grid.unina.it/software/ITG/download.php

2)pacgen - Ethernet IP TCP/UDP packet generating tool for Linux
http://nixbit.com/cat/system/networking/pacgen/

3)Hping is a command-line oriented TCP/IP packet assembler/analyzer download

4)Nessus Vulnerability Scanner from Tenable Network Security download

5)Tcpreplay is to resend all packets from its input file(s) at the speed at which they were recorded, at some specified data rate download

6)Nemesis is a command-line network packet crafting and injection utility for for testing Network Intrusion System download

7)PackETH is a *graphical* packet generator tool for ethernet download