ACML Version 2.0 - AMD Core Math Library for 32-bit Windows™
The ACML is a tuned math library designed for high performance on AMD64 processors including: AMD Opteron™ and AMD Athlon™ 64. This version includes 32-bit libraries. A full suite of Basic Linear Algebra (BLAS) routines and Linear Algebra (LAPACK) routines, plus a A comprehensive suite of Fast Fourier Transforms (FFTs) in both single-, double-, single-complex and double-complex data types.
ACML Version 2.0 with 32-bit and 64-bit libraries is available for Linux.

ACML Version 2.0 - AMD Core Math Library for 32-bit/64-bit Linux
The ACML is a tuned math library designed for high performance on AMD64 processors including: AMD Opteron™ and AMD Athlon™ 64. 32-bit and 64-bit libraries include a full suite of Basic Linear Algebra (BLAS) routines and Linear Algebra (LAPACK) routines, plus a comprehensive suite of Fast Fourier Transforms (FFTs) in both single-, double-, single-complex and double-complex data types.
http://www.developwithamd.com/apppartnerprog/acml/home/index.cfm?action=home

GNU glibc (Open Source)
The GNU C library is used as the C library in the GNU system and most systems with the Linux kernel. The GNU C library is primarily designed to be a portable and high performance C library.
GNU glibc 2.3.2 is AMD64 optimized.