RPyGTK is a GTK+ based frontend for R designed for use in the physical sciences and integration with LaTeX.
mdz (Mandelbrot Deep Zoom) is a Mandelbrot set image generator focused on exploration into really deep areas of the Mandelbrot set, and without fanciful distractions. mdz uses the MPFR maths precision library to zoom really deep.
A Web-based personal RSS/ATOM news aggregator and feeds reader.
A full featured file system for Amazon S3 and other online storage services.