High Quality Content by WIKIPEDIA articles! Harbour is a modern computer programming language. It is a Clipper-compatible compiler which is cross-platform, running on many operating systems (DOS, Microsoft Windows, Linux, Unix variants, several BSD descendants, Mac OS X, MINIX 3, Windows CE, Pocket PC, Symbian, iPhone, QNX, VxWorks, OS/2/eComStation, BeOS/Haiku, AIX) using the same source code and databases.