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. It is intended to do about the same things as ttlscan, nmap, hping, queso, p0f, xprobe, arping, arp-sk, arpspoof, firewalk, irpas, tethereal, tcpdump, etc.
sipsak is a command line tool for performing various tests on Session Initiation Protocol (SIP) applications and devices. It can make several different tests, send the contents of a file, and interpret and react on the responses. It supports (de-) registration with given contact URIs and digest authentication.
LANforge is a unified multi-protocol network traffic generation and WAN emulation application. It allows users to generate real world customer traffic in a controllable manner. The WAN emulator allows the injection of latency and other network oddities like dropped, duplicated, and re-ordered packets. LANforge includes a drag-and-drop virtual network builder that supports virtual routers, WAN links, traffic-generating nodes, and more. It provides a scriptable command line interface with Perl libraries as well as a graphical user interface.
IPv6 CARE, "IPv6 Compliant Automatic Runtime Environment", provides an environment where applications instantly become IPv6-compliant ('patch' mode, see RFC6535). It can also generate a diagnosis about the IPv6 compliance of an application ('check' mode). It uses an LD_PRELOAD-based library injection technique.
pftp allows you to send and receive files and directories recursively, send and receive standard input and ouput, filter your connection, set the net buffer size, set the bandwidth, send UDP datagrams unicasted, broadcasted, and multicasted (which is meant for AUDIO and VIDEO streaming), send data to another user and manage that data, perform a network test based on either UDP or TCP, and use optimized buffers for your Gigabit Ethernet links. pftp can start from command line, as a daemon, or by inetd. All features are supported for IPv4 and IPv6.
GASP is a generic protocol encoder and decoder. It offers a complete scripting language (based on Tcl) which allows you to construct or analyze any packet of data based on abstract protocol definition. This version includes all the basics networking protocols (IP, ARP, ICMP, TCP, UDP, and DNS), some protocols for archivers (ZIP, GZIP, and TAR), and some multimedia protocols (JPEG, GIF, and PNG).