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net6 is a library which eases the development of network-based applications as it provides a TCP protocol abstraction for C++. It is portable to both the Windows and Unix-like platforms.

Netcat is a simple Unix utility which reads and writes data across network connections using TCP or UDP protocol. It is designed to be a reliable "back-end" tool that can be used directly or easily driven by other programs and scripts. At the same time it is a feature-rich network debugging and exploration tool, since it can create almost any kind of connection you would need and has several interesting built-in capabilities.

Netdude is the NETwork DUmp data Displayer and Editor for tcpdump tracefiles. It is a GUI-based tool that allows you to make detailed changes to packets in tcpdump tracefiles.

Netmap can be used to make a graphical representation of the surrounding network. It first uses traceroute to make a list of all routers and their interconnections, after which it generates a .dot file.

NetStrain is a tool to measure practical data throughput between two machines over a TCP connection. It can be used for performance testing, stress/stability testing and to demonstrate various network effects. It supports both IPv4 and IPv6, provided the underlying system does.

Neubot is a research project on network neutrality of the NEXA Center for Internet & Society at Politecnico di Torino. The project is based on a lightweight open-source program that interested users can download and install on their computers. The program runs in background and periodically performs transmission tests with some test servers and with other instances of the program itself. These transmission tests probe the Internet using various application level protocols. The program saves tests results locally and uploads them on the project servers. The collected dataset contains samples from various Providers and allows to monitor network neutrality.

ngrep strives to provide most of GNU grep's common features, applying them to the network layer. ngrep a pcap-aware tool that will allow you to specify extended regular expressions to match against data payloads of packets. It currently recognizes TCP, UDP, and ICMP across Ethernet, PPP, SLIP, FDDI, Token Ring and null interfaces, and understands BPF filter logic in the same fashion as more common packet sniffing tools, like tcpdump and snoop.

OpenBGPD is a FREE implementation of the Border Gateway Protocol, Version 4. It allows ordinary machines to be used as routers exchanging routes with other systems speaking the BGP protocol.

TCP wrappers library.

The Packet Debugger (pdb) is a program which allows people to work with packet streams as if they were working with a source code debugger. Users can list, inspect, modify, and retransmit any packet from captured files as well as work with live packet capture.