For what purpose is pure C used today?

Question

C++ / C#

For what purposes is pure C used in our time? Well, except for the development of embedded systems.

Answer 1

System programming in linux, PL development, writing linux kernel drivers/modules, sometimes just for high performance network daemons.

Answer 2

Linux kernel, firewood and modules for it
СPython (for the uninitiated - "just a python"), libraries for it

Answer 3

In World of Tanks it is even used to write the backend

Answer 4

all