Create beautiful financial plans with a level of nuance and flexibility that exceeds the standard retirement calculators. Run Monte Carlo simulations, backtest on historical data, plan how to live life on your terms, and reduce anxiety around your finances.
Alpha-Trader.com is a financial market simulation in which the players make the market. The players run, start and own businesses. You trade in stocks of these companies and other securities.
PhET provides fun, free, interactive, research-based science and mathematics simulations. The simulations are written in HTML5 and can be run online or downloaded to your computer. All simulations are open source. (from the product's site)