Anyone have any idea why there haven't been any open-source QNX clones, at least not any widely known ones? Even before their Photon MicroGUI patents expired, the clones could have used X11.
I used to occasionally boot into QNX on my desktop in college. It was a very responsive and stable system.
Hypervisors are, to a first approximation, microkernels with a hardware-like interface. All of this kernel bypass work being done by RDBMSes, ScyllaDB, HFTs, etc. is, to a first approximation, making a monolithic kernel act a bit like a microkernel.
There are well known open source microkernels, like Minix 3 and L4. Probably not that attractive.
Why something hasn't been done is always a hard question to answer, since to succeed a lot of things have to go right, and by default none of them do. But one thing is that microkernels were more trendy in the 90s - r&d people are mostly doing things like "the cluster is the computer", unikernel, exokernel, rump kernel, embedded (eg tock), remote attestation since then (I'm not up to date on the latest).
Thinking about it a bit more, QNX clones might suffer from something akin to second system syndrome. There's a simple working design, and it likely strongly invites people to jump right to their own twist on the design before they get very far into a clone.
I used to occasionally boot into QNX on my desktop in college. It was a very responsive and stable system.
Hypervisors are, to a first approximation, microkernels with a hardware-like interface. All of this kernel bypass work being done by RDBMSes, ScyllaDB, HFTs, etc. is, to a first approximation, making a monolithic kernel act a bit like a microkernel.