Scapy : Interactive packet manipulation tool
Scapy is a powerful interactive packet manipulation tool, packet generator, network scanner, network discovery tool, and packet sniffer. It provides classes to interactively create packets or sets of packets, manipulate them, send them over the wire, sniff other packets from the wire, match answers and replies, and more. Interaction is provided by the Python interpreter, so Python programming structures can be used (such as variables, loops, and functions). Report modules are possible and easy to make.
Yersinia
Yersinia : A multi-protocol low-level attack tool Yersinia is a low-level protocol attack tool useful for penetration testing. It is capable of many diverse attacks