Several users recommend interactive physics programs for learning and experimentation, highlighting options like Phun, a 2D physics sandbox, and vPython, which integrates mathematics with physics concepts. Other notable mentions include PhET simulations from the University of Colorado, which are popular in educational settings but may require guidance for effective use. Open Source Physics and various math and physics resources are also suggested for those interested in deeper exploration. Overall, these programs offer valuable tools for engaging with physics and mathematics in an interactive manner.