This is QRV, an adaptation (and later re-implementation) of the famous QNX Neutrino 6.4 operating system to modern 64-bit hardware, aimed primarily at keeping the Transparent Distributed Processing in the system.

Key differences from the standard QNX 6.4:

• All code is 64-bit (LP64 model)
• re-organized source tree
• integration of startup into the same source tree
• (planned) configuration system, same as in Linux
• getting rid of callouts/callins/patchers
• simplifications in the scheduler, multicore-only
• Unix filesystem (taken from xv6)
• disk device driver (devb) for QEMU virtio (taken from xv6)

Observations and insights regarding this porting can be read in my blog: https://r-tty.blogspot.com