PyMOL downloads as a compressed file, and it leaves behind folders when you uninstall it. PyMOL is a serious scientific tool supported by a dedicated open source community. The molecular simulations are fun to play with, but they're good enough for a PBS science show. But there's ample help and truly extensive documentation, including source code, at the product's Web site, where there are even links to impressive YouTube demos. This was the vision of the original PyMOL author Warren L. PyMOL can interpret over 30 different file formats from PDB files to multi-SDF.
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Please support development of this open, effective, and affordable software by purchasing an incentive copy, which is pre-built and comes with maintenance and support. The open source project is maintained by Schrödinger and ultimately funded by everyone who purchases a PyMOL license. PyMOL is a user-sponsored molecular visualization system on an open-source foundation. The interface is well laid out and fairly intuitive, considering the program's esoteric function. PyMOL is a commercial product, but we make most of its source code freely available under a permissive license. Using PyMOL is surprisingly easy, even if you lack knowledge of chemistry. It runs in Windows, Mac OS, Linux, and Unix. It will also render artistic visualizations of geometric figures, interactive visualizations, and animated displays.
Now DeLano Scientific has upped the ante by lowering the cost of quality scientific tools to the monetary equivalent of Absolute Zero: as in "free." Its PyMOL is a free Open Source molecular viewing engine, rendering tool, and editor that can visualize 3D molecular structure down to the atomic level, including the X-ray crystallographic structure of proteins, DNA, RNA, carbohydrates, metabolites, sugars, and much more. But more and more research-quality software is showing up at affordable prices. You'd need a research grant to afford most science-worthy tools, though, and an advanced degree to use them.
The favor's since been returned: 3D graphics have revolutionized scientific visualization. The needs of science sparked the development of the electronic computer, which led to the PC and today's multimedia-driven world.