SoQt is a Qt GUI component toolkit library for Coin, based on the API of the InventorXt GUI component toolkit. SoQt is also compatible with OpenInventor of SGI and TGS. . SoQt provides a class-hierarchy of viewer classes that ranges from a simple render canvas (the SoQtRenderArea), providing only the basic synchronization and device input conversion routines between Qt and Coin, up to 3 different full-featured viewer classes (SoQtExaminerViewer, SoQtPlaneViewer and SoQtFlyViewer) with input device handling logic and user interfaces to let the application programmer do Rapid Application Development. . This library is linked against Qt version 4.