Araucaria

a screenshot of Araucaria
Screenshot 1: An example Araucaria argument.

Araucaria allows users to extract the arguments from text and represent them diagramatically in an argument map. In the screenshot above, the text is taken from a letter in the New Scientist. Arguments that are extracted from the text are shown in boxes with a solid border. Implicit arguments are shown with dashed boxes. The screenshot shows the structure of an argument about a spacecraft returning commet material back to earth. The claim "there is no danger in the Stardust Mission bringing material from the Wild 2 commet back to Earth", is supported by an explicit premise, "40,000 tonnes of commetary stuff enters our atmosphere every year" and an implicit premise, "the material that falls to Earth, naturally is the same as the material brought back by the Stardust Mission" that is then rebutted by the author of the original letter with the argument, "this material wasnt carefully packaged in a capsule designed to protect it on it's journey through the atmosphere". Araucaria has a choice of several different visualisations of the same argument. In the second screenshot, which shows the same argument map, the rebuttal is much clearer.

a screenshot of Araucaria
Screenshot 2: The same example argument with a different view - the scaled standard view.