parafuzz is a fuzzing tool for macos
At the moment it can only fuzz iokit drivers in a limited way but has found many bugs so far.
Published/Fixed bugs:
CVE-2019-8629 (MacOS 10.14.5 - Intel Graphics Driver)
CVE-2019-8693 (MacOS 10.14.6 - AppleGraphicsControl)
CVE-2019-8691 (MacOS 10.14.6 - Graphics Drivers)
CVE-2019-8694 (MacOS 10.14.6 - IOAcceleratorFamily)
CVE-2019-8817 (MacOs 10.14.6 - AppleGraphicsControl)