qGo
qGo was the predecessor of gGo. Its developer, Peter Strempel, migrated it to Java and renamed it gGo. Later, others took up the development of qGo and made it a sourceforge project, once again based on C++ and the Qt toolkit.
qGo runs on any Qt capable platform (Windows, *NIX, Mac OS X) , is full featured and coming along nicely.
It has been comprehensively enhanced by the developers recently (early 2006)
The latest stable version (1.5.4) appears to be from March 2008.
qgo2
qgo2 was supposed to be a rewrite for newest Qt versions, supporting even multiple servers (including igs, Tygem, oro), latest info can be found on following links:
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http://qgo.sourceforge.net/ homepage (of qgo and qgo2)
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http://sourceforge.net/mailarchive/forum.php?forum_name=qgo-announce2 latest info
Its currently only available from svn and still very buggy.