xview

XView is a widget toolkit from Sun Microsystems introduced in 1988, providing an OPEN LOOK user interface for X Window System applications. It has the same look and feel of the earlier SunView system, and provides a similar object-oriented application programming interface for the C programming language. Sun also produced the User Interface Toolkit (UIT), a C++ API to XView. The XView source code has been freely available since the early 1990s, making it the "first open-source professional-quality X Window System toolkit" http://www.darwinsys.com/history/index.shtml. XView was later abandoned by Sun in favor of Motif (the basis of CDE), and more recently GTK+ (the basis of GNOME). XView was reputedly the first system to use right-button context menus http://www.darwinsys.com/history/index.shtml, which are now ubiquitous among computer user interfaces.

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