NFM-DS: The Null-field Method with Discrete Sources is an extension of the Null-field Method (also called T-Matrix Method) to compute light scattering by arbitrarily shaped dielectric particles. The Fortran code is inculded on CD with the book: Adrian Doicu, Thomas Wriedt and Yuri Eremin: Light Scattering by Systems of Particles. Null-Field Method with Discrete Sources - Theory and Programs. Springer Verlag; Berlin, Heidelberg, New York 2006.