SimCalc Mathworlds is an educational software that uses multiple representations like animations and simulations with a modeling approach to teach concepts like rate of change, limits, and accumulation through familiar phenomena normally not covered until calculus courses. Students can freely explore different models through simulations and change parameters to observe results, with automated data collection and 2D graphical visualization designed by modelers. However, the software has potential drawbacks like an inability to manipulate code, non-intuitive user interface, and bugs in the demo version.