I just found about this distro, which is relatively new (2021). Its specificity is that it doesn't features any GNU software by default, which I find interesting.
This means Chimera is not a GNU/Linux system, as it utilizes neither GNU utilities, nor GNU libc, nor GNU toolchain. The system is bootstrappable almost entirely without any GNU components (other than make) and is capable of booting without them (however, most people will have some).
I'd guess they'll move to some bsd make at some point.