Glibc
glibc is a standard library for the C programming language developed by the GNU project along with GCC. Not only does it support functions commonly found in C standard libraries such as open, malloc and printf but also provides more useful functions as well. In-line assembly language code are embedded to improve runtime performance.It is generally considered the most complete, robust and portable C library ever created.
The latest version of glibc is 2.3.2.