Plan 9
From Wikipedia:
Plan 9 replaced Unix as Bell Labs's primary platform for operating systems research.
- 1995: Plan 9 from Bell Labs
- 1999: The Styx Architecture for Distributed Systems
- by Rob Pike and Dennis Ritchie
- Basis of the 9p protocol
- 2005: The Ubiquitous Fileserver
- 2021: Plan 9 Foundation
- ownership transferred from Nokia to Foundation