This site has online tools to aid in running Role Playing Games.
The DPR Calculators determine the average damage dealt per round for different attack or spell-casting combinations in a round using different D20 rules systems.
The Plot and Encounter Generators create random plots and encounters in different environments appropriate for the party level and include area descriptions, traps, secret doors, treasures, and creature behaviour.
Click on the Menu along the header bar to select the App you wish to use and settings to choose your D20 Rules System.