Earlier quoted context omitted.
There is the freebsd libc; they run their own.
Which is in fact the most used, and arguably technically superior to glibc. freebsd -> darwin, openbsd, netbsd and dragonfly bsd. openbsd and netbsd like to add their own stuff on top of it also. The Open Watcom libc and bionic are also superior. bionic is getting better and better recently. musl is in some parts better, in some parts worse. Same for Embarcadero C++ libc. Worse than glibc are only: the two MS libc's,…
Perhaps glibc isn't that bad...