PIP
Useful crossplatform library for distributed systems
...Contain string, thread, timer, file, config file, serial port, ethernet (UDP, TCP, broadcast, multicast), protocol, multiprotocol, peer, console, variable, struct, evaluator, system monitor (Linux only), CLI (command-line interface) parser.
Package include library that you can build with 'qmake' or 'CMake' and test program in 'main.cpp'.
Online documentation: http://ppip.sourceforge.net/doc/