Here are the classes, structs, unions and interfaces with brief descriptions:

gcollection
GBaseSampleFFT
GCollectionT
GExtremaFinder
GInterval
GIntervalList
GItem
GItemList
GIterT
GListIterT
GListT
GLogMessage
GMatrix4
GMatrixT
GNamed
GNamedListT
GOptionString
GPointer
GPointerList
GRealSampleFFT
GSortListT
GString
GStringList
GSubItem
GTreeBranchT
GTreeLeafT
GTreeNodeT
GVectIterT
GVector4
GVectorT
GVectT