I have ported Qorvo/Decawave’s DWM3000 SDK v1.1 to Zephyr v2.5: here.
If interested, please read the README.md file included in the project.
There are two supported host boards: PCA10040 (nRF52832) and the PCA10056 (nRF52840).
You will need one of these two boards and the Qorvo DWS3000 arduino-shield board.
At this early-release stage, there may be “issues”, but my testing has not uncovered any significant problem. Consider this a beta release.