The project's webpage is at http://common-lisp.net/projects/l-math.
L-MATH is licensed under the GPL with the classpath exception. Development occurs on Launchpad. Tarballs are available from here, and documentation is available in the README file.
ASDF-install package (obsolete) http://common-lisp.net/projects/l-math/releases/l-math_0.3.2.tar.gz