XView
![SunOS XView calctool](/Images/godic/202502/21/Xview-calctool1030.png")
![](/Images/godic/202502/21/Xlib_and_XCB_in_the_X_Window_System_graphics_stack.svg1031.png")
XView is a widget toolkit from Sun Microsystems introduced in 1988. It provides an OPEN LOOK user interface for X Window System applications, with an object-oriented application programming interface (API) for the C programming language. Its interface, controls, and layouts are very close to that of the earlier SunView window system, making it easy to convert existing applications from SunView to X. Sun also produced the User Interface Toolkit (UIT), a C++ API to XView.