Historical Molecular Graphics - Digitized versions of 16mm movies of molecular structures produced in the early days of interactive molecular graphics. OpenRasMol - Provided for the convenience of users and software developers of open source versions of RasMol. VMD - A free program for visualization and analysis of biological systems such as proteins, nucleic acids, and lipid bilayer assemblies. Molymod Molecular Models - Plastic molecular models for use in chemistry, biochemistry, molecular biology (DNA double helix), semiconductors and crystal lattice structures. Labquip - Plastic molecular models for constructing polypeptides and DNA molecules. Biodesigner and iMol - A molecular viewer for Windows9x systems with sequence editor and protein builder. Free for academic use. Additionaly the iMol molecule viewer is available for Mac OS X systems. RasMol - Molecular visualization freeware for proteins, DNA, and macromolecules. Freely available for Windows, Macintosh, and UNIX. Jmol - Open source molecule viewer written in Java. It runs as a standalone application and as a web browser applet. Viewmol - An open-source graphical front end for computational chemistry programs such as Gaussian, Gamess, and Mopac. Available for Linux, FreeBSD, Mac OS X, and other Unices. SweetMollyGrace - A suite of freeware tools for automating work of rendering and animating molecules. Generates high quality images of molecules from PDB, XYZ, or molfiles using raytracing tools (Povray and Raster3D). ChemCraft - Windows-based program for visualization of molecular structures, vibrational modes, molecular orbitals, energy gradient and other properties from log files produced by the GAMESS and Gaussian packages. MOLDEN - Pre- and post-processing program for molecular and electronic structure, with Z-matrix editor, electron density visualization, and molecule animations. Available for Unix and VMS; free for academic use. Protein Explorer - A web-based viewer for the 3D structures of proteins, DNA and RNA. Requires Netscape and the Chime plugin, which is only available for Windows9x. Facio - 3D-Molecular Modeling Software, available at no charge for the Windows platform. Has functions for visualization of biomolecules and results from GAMESS QM calculations, and for aligning and modifying structures. UCSF Chimera - Highly extensible, interactive molecular graphics program. It is the successor to UCSF Midas and MidasPlus. Free of charge for academic, government, non-profit, and personal use. PyMolWiki - User-contributed wiki to supplement the PyMOL documentation. Nanotube Modeler - A program for generating and visualizing the xyz-coordinates for nanotubes, nanocones, nanosheets, and fullerenes. For Windows; free demo version available. CueMol - Free molecular structure visualization and rendering program for Windows. Santorini and Patmos, Molecular Viewer and Screensaver - Read XYZ or PDB files of atoms and display them in a 3-dimensional view on Windows PCs. Review of Molecular Modelling Programs - Reviews, screenshots, and table of features comparing over a dozen freely available molecular modelling and viewing programs. Jamberoo: Cross Platform Molecular Editor - Free cross-platform application for displaying, analyzing, editing, converting and animating molecular systems. Avogadro - Open source advanced molecular editor designed for cross-platform use in computational chemistry, molecular modeling, bioinformatics, materials science and related areas. It offers flexible rendering and a powerful plugin architecture. PyMOL - A free and flexible molecular graphics and modelling package which can be also used to generate animated sequences.