QNX 8 goes freeware - for non-commercial useQNX Version 8 is now freely available for non-commercial use, expanding its reach under the QNX Everywhere initiative.
Redox OS is the fastest Linux distro I've tested, and you should try it despite what it's missingRedox OS, while experimental and unstable, impresses with its incredible speed in app launch times, showcasing an efficient microkernel design.