There is another doomed project that XROS reminds me of: the Apple "Pink" OS. Brief history: https://lowendmac.com/2014/pink-apples-first-stab-at-a-moder... "Pink was spun out as Taligent. The kernel was jettisoned. Taligent would run on top of an operating system and act as an object oriented system (like OpenStep). It was released in 1995, but it sold poorly. It was canceled altogether in 1998." https://en.wikipedia.org/wiki/Taligent?useskin=vector more history http://www.roughlydrafted.com/RD/Q4.06/36A61A87-064B-470D-88... After Apple tried Pink, Taligent, and Copeland they .... ended up using Mach / FreeBSD and some pieces from other BSDs (as I understand it). Today, we have Windows and Unix of some flavor in the main. I think Geordi LaForge was using one of these OSs on his Warp Drive computers...