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"LearnersTV offers free online interactive science animations on subjects like Biology, Physics and Chemistry. These Animations will help you visualize and understand difficult concepts."

The Molecular Workbench (MW) software: Is a modeling tool for designing and conducting computational experiments across science. Provides an authoring system for instructional designers to create and publish model and simulation-based curriculum materials. Delivers an interactive learning environment that supports science inquiry. Is free and open-source.

This interactive site is great for seeing how the body, chemicals, tools, etc. work. Excellent study and demonstration resource.