The C++ Portable Components currently consist of four libraries.

The Foundation library contains a platform abstraction layer
(including classes for multithreading, file system access, logging,
etc.), as well as a large number of useful utility classes, such
various stream buffer and stream classes, URI handling, and many
more.

The Net library contains network classes (sockets, HTTP, etc.)

The XML library contains an XML parser with SAX2 and DOM interfaces,
as well as an XMLWriter.

The Util library contains classes for working with configuration
files and command line arguments, as well as various utility classes.

WWW: http://pocoproject.org/