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D20 Calculator is a graphical roller for a d20 based RPG. The program recognizes commonly used expressions such as "3d8+4", rolls, totals, and displays the results in a detailed, yet easy to read format.
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Dungeon Shell is a shell for D20 Dungeon Masters. Simple commands allow DM to manage a game session and track characters and monsters statistics. It is written in Java (1.4.0 at least). Data is stored in XML and you can script it with j[p]ython.
GM's support script for d20 gaming systems with non-player character generation, generation of multiple monster and treasure capabilities. Designed to support game masters by providing individualised opponents, NPCs and treasure without the dicerolling.