I guess GNU Hurd [1], jokingly speaking, but correct from an architecture (ukernel) point of view. The real community-driven alternative is Linux, which starte

I guess GNU Hurd [1], jokingly speaking, but correct from an architecture (ukernel) point of view. The real community-driven alternative is Linux, which started and still is a monolithic kernel, but the multiple features it got along the years may make the distinction even less clear [2]. It seems it will also accept some Rust code in the future, so the difference may drop even in languages used. [3] [1] https://www.gnu.org/software/hurd/ https://www.gnu.org/software/hurd/ [2] https://qconlondon.com/system/files/presentation-slides/thomas_graf_-_ebpf_-_rethinking_the_linux_kernel.pdf https://qconlondon.com/system/files/presentation-slides/thom... [3] https://lore.kernel.org/lkml/CANiq72khBa2GcB6-PHM3A44Y90d6vzYAS=BVpk3nT4B6u+NVDw@mail.gmail.com/T/#mb5e524dae9d5a5815c6e68eb36b9bde4e87c861d https://lore.kernel.org/lkml/CANiq72khBa2GcB6-PHM3A44Y90d6vz...