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A library of interactive, web-based virtual manipulatives or concept tutorials, mostly in the form of Java applets, for mathematics instruction

"GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages"

Swiss PDB Viewer is a free program to display, analyze and manipulate PDB protein structures. Next to features such as protein superimposition, H-bond detection, amino acid mutation etc., the protein is tightly linked to Swiss- Model, an automated homology modeling server running at the Geneva Biomedical Research Center. This allows for threading a protein primary sequence to a 3D template and analyzing homology. The displaying options of the program include spacefill, ball & stick, stick and ribbon representations, all of which can be applied simultaneously within one structure model.