After Apple Computer purchased NeXT and turned NeXTSTEP into the Mac OS X operating system, the NeXTSTEP version of Project Builder became ProjectBuilderWO (maintained only for WebObjects development). Apple created a new Project Builder from scratch for software development with the first version being introduced with Developer Preview 4 of Mac OS X.[3] This version of Project Builder, informally dubbed PBX.[4] was distributed with the first few versions of Mac OS X but with the release of Mac OS X v10.3 it was redesigned, reintegrated with Interface Builder and rebranded as Xcode.[5][6][7]
GNUstep's ProjectCenter IDE is a rough workalike of the original NextStep design; additional functionality is provided by ProjectManager, a 3rd-party GNUstep IDE meant for greater usability.
^Dippery, Michael (2 June 2015). Professional Swift. John Wiley & Sons. p. 36. ISBN9781119016779. Xcode is based on Project Builder, an IDE you use to write programs for the NeXTSTEP operating system, the forerunner of Mac OS X
^Wentk, Richard (June 2011). Xcode 4. John Wiley & Sons. p. 5. ISBN9781118108260. A free copy of Project Builder was bundled with every copy of OS X
^"OS X's ten most innovative features". Macworld. Sep 13, 2010. ...Included in the package was an IDE—Project Builder—that was a tweaked version of the IDE that came with NeXT, the OS whose acquisition laid much of the foundation for OS X. In 2003, Project Builder became the now familiar Xcode...
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