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NeXTSTEP is a GUI developed by NeXT computer for Unix based systems that was first released in 1989. NeXTSTEP later (1994) led to the development of OPENSTEP through a collaboration with Sun Microsystems. 

The NeXT Computer company was founded by Steve Jobs in 1985 and Susan Kare was also part of the design team. Later in 1995 Apple acquired NeXT and used the OPENSTEP OS as the basis of the OS X. NeXTSTEP was the first GUI to feature the dock or taskbar for launching and monitoring active applications.

NeXTSTEP screenshot
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