Downloading Newton3D 0.1 from our website was free. The program lies within Education Tools, more precisely Science Tools. The actual developer of the free software is Jose Ignacio Romero. The following version: 0.1 was the most frequently downloaded one by the program users.
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.