Wireshark is a network protocol analyzer for Unix and Windows. List of features.

A software that monitors your servers and applications. Zabbix can be used for logging, monitoring, capacity planning, availability and performance measurement, and providing the latest information to a helpdesk.

Linux IPv6 Development Project.

Aims to improve the scalability and robustness of Linux to support greater network server workloads more reliably.

A C++ library for heavy duty networking applications. For Objects Management, Events, Signals, Timing, and Asynchrone Stream Devices.

Sysmon is a network monitoring tool designed to provide high performance and accurate network monitoring. Currently supported protocols include SMTP, IMAP, HTTP, TCP, UDP, Radius, NNTP, and PING tests

Software that simplifies PPP setup for Linux.

Homepage of the StreamModule project. A library designed to simplify putting together programs that communicate over a network. Eschews threading and RPC style request response design.

Using a laptop in different network environments.

Linux performance tuning resource site.