Download of Newton3D 0.1 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program is categorized as Education Tools. The following version: 0.1 is the most frequently downloaded one by the program users. We recommend checking the downloaded files with any free antivirus. The actual developer of the free program is Jose Ignacio Romero.
From the developer:
Newton 3D is an newton/physics simulator program for easy learning. French mathematician Joseph-Louis Lagrange often said that Newton was the greatest genius who ever lived, and once added that Newton was also "the most fortunate, for we cannot find more than once a system of the world to establish." This program has its name and simulates some of his theories.
You may want to check out more software, such as CAEFEM, Photometric Toolbox32 or GenealogicaGrafica, which might be related to Newton3D.