Last updated in 2012, the original implementation (Java) can be found at: https://math.nist.gov/javanumerics/jama/
The (JS) translation can be found at: https://github.com/conceptualGabrielPutnam/JAMA4JS
The translation passes all verification tests and can perform: Cholesky, LU, QR, SVD, symmetric/non-symmetric decomposition as well as being used for solving least squares and nonsingular systems.
Thanks to: Ronald F. Boisvert, Bruce Miller, Roldan Pozo, Karin Remington, Joe Hicklin, Cleve Moler, and Peter Webb for creating the original implementation.