Newtons Aquarium 1.1 for Mac was available as a free download on our software library. The program lies within Education Tools, more precisely Science.
From the developer:
Newton's Aquarium is an interactive physics package that helps students visualize and understand Newton's Law of Universal Gravitation. While building and exploring their own solar systems, students are exposed to many of the core concepts in kinematics. Newton's Aquarium was designed for use in senior high school and college physics courses.
You may want to check out more Mac applications, such as Newton Mail, Newton or Goldfish Aquarium, which might be related to Newtons Aquarium.
Science Tools
Science Tools