Yes, that Wikipedia link is the one I mean. It was sold independently but was also the native OS of the Atari Transputer Workstation. Like Plan9, Helios has se

Yes, that Wikipedia link is the one I mean. It was sold independently but was also the native OS of the Atari Transputer Workstation. Like Plan9, Helios has servers that export a namespace into a common tree. The Helios server protocol is very similar to 9p. They appear to have evolved independently though. Plan9 allows each user to manage their own namespace by mounting stuff into it. In Helios, there’s a shared global tree that spans all the Transputers in the system. Both are Unix-like, although Helios probably tried harder to maintain a POSIX-like API.