Name: dtc
Homepage: https://git.kernel.org/pub/scm/utils/dtc/dtc.git
Why should this be included in the repository: Useful tool for kernel development. I personally use it for the kernels of select Google Pixel devices.
Is it Open Source: Yes
Who and how many users do you anticipate will use this software: I know a few individuals but outside of that I don't know too many people who work on kernel development on Solus (besides DataDrake and Josh ofc).
Tarball:
https://git.kernel.org/pub/scm/utils/dtc/dtc.git/snapshot/dtc-1.5.1.tar.gz
I've also made a package for it here.
https://github.com/ZVNexus/dtc