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Fixpoint is a presentation software written in Scheme (Gauche), using Gdk and Pango for drawing. Slides can be prepared in a plain text file (Wiki-like markup and/or SXML), mixed with Scheme expressions.
This project is a framework (i.e., library) for Mac OS X applications to link in. It provides plots of data together with the supporting machinery (objects inheriting from NSDocument, for example) that
applications can use to manipulate the plots.