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Celtx is the world's first all-in-one media pre-production software. It has everything you need to take your story from concept to production. Celtx replaces 'paper, pen & binder' pre-production with a digital approach that's more complete, simpler to work with, and easier to share.
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PCGen is a character generator for role-playing games. It currently is aimed at supporting as many RPGs as is humanly possible. The project's current focus is on OGL games (OGL is Wizards of the Coast's Open Gaming License). PCGen runs on Windows, Mac OS X and Unix/Linux using Java 1.4/1.5.
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RPTools is a brand of open-source programs designed to enhance traditional pen-and-paper role playing games. They can be used for face-to-face play, or Internet role-playing in real time even if your players are on the other side of the world. MapTool in particular works great with voice-chat services!