ChemInnovation Software (Popularity: ): Chemistry 4-D Draw high-quality structures quickly by entering molecular names. It also assigns systematic names, drawing and text editing. JChemPaint (Popularity: ): Free, open-source editor for 2D chemical structures. Written in Java. JMolDraw (Popularity: ): Drawing applet written in Java for use in database applications in chemistry. OpenRasMol (Popularity: ): Provided for the convenience of users and software developers of open source versions of RasMol. Pymol (Popularity: ): A free and flexible molecular graphics and modelling package which can be also used to generate animated sequences. ProteinScope (Popularity: ): ProteinScope is a free program to view and create animations of Protein Data Bank PDB files. Biodesigner and iMol (Popularity: ): 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. Molcular Model Kits (Popularity: ): Plastic molecular structure models for research and education in science, intended especially for biochemistry. Jmol (Popularity: ): Open source molecule viewer written in Java. It runs as a standalone application and as a web browser applet. Viewmol (Popularity: ): 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.