C++Test is a portable and powerful, yet simple, unit testing framework for handling automated tests in C++. The focus lies on usability and extendability. Several output formats are supported and new ones are easily added.
libxspf (formerly called libSpiff) is a C++ library for reading and writing XSPF playlists. Both version 0 and 1 are supported. It is the official reference implementation for XSPF of the Xiph.Org Foundation.
RNV is an implementation of Relax NG Compact
Syntax validator. It is written in ANSI C and the
command-line utility uses Expat. It is a part of
an on-going work, and the current code may have
bugs and shortcomings; however, it validates
documents against a number of grammars.