Calistry.org!

Wolfram Alpha is a "Computational Knowledge Engine" - different from a search engine, it answers factual queries directly by computing the answer from structured data, rather than providing a list of documents or web pages that might contain the answer.

Avogadro is a free, fantastically easy to use molecule editor.

PyMOL is a powerful and comprehensive molecular visualization product for rendering and animating 3D molecular structures.

RasMol is a computer program written for molecular graphics visualization intended and used primarily for the depiction and exploration of biological macromolecule structures, such as those found in the Protein Data Bank. It was originally developed by Roger Sayle in the early 90s.Historically, it was an important tool for molecular biologists since the extremely optimized program allowed the software to run on (then) modestly powerful personal computers. Before RasMol, visualization software ran on graphics workstations that, due to their expense, were less accessible to scholars. RasMol has become an important educational tool as well as continuing to be an important tool for research in structural biology.RasMol has a complex version history. Starting with the series of 2.7 versions, RasMol is licensed under a dual license (GPL or custom license RASLIC).RasMol includes a language (for selecting certain protein chains, or changing colors etc.). Jmol and Sirius has incorporated the RasMol scripting language into its commands.Protein Databank (PDB) files can be downloaded for visualization from members of the Worldwide Protein Data Bank (wwPDB). These have been uploaded by researchers who have characterized the structure of molecules usually by X-ray crystallography, NMR spectroscopy or electron microscopy. »

Think calculator for Finance, Math, Geometry, Converter, Physic & Chemistry, Webtoolsm Date and time and more

The Units program converts quantities expressed in various scales to their equivalents in other scales. The units program can handle multiplicative scale changes as well as nonlinear conversions such as Fahrenheit to Celsius or wire gauge. Units comes with an annotated, extendable database defining over two thousand units.

Jmol is a free, open source molecule viewer for students, educators, and researchers in chemistry and biochemistry. It is cross-platform, running on Windows, Mac OS X, and Linux/Unix systems.

Periodic table app for chemistry with solubility table, molar calculator, and atom models.

Ghemical is computational chemistry package, which is licensed under GNU GPL . The ghemical authors are listed here .

Physics Formulas Calculator comprises a selection of 119 different calculators that will simplify calculations which have given you headaches so far. Complex calculations, such as Force, Static Friction and others listed below will be handled easily with this app. > Force> Work> Total Work> Power with Work> Power with Displacement> Power with Velocity> Kinetic Energy> Potential Energy> Centripetal (Centrifugal) Acceleration> Concave Mirror Magnification> Centripetal Force> Circular Velocity> Velocity> Average Velocity> Displacement> Kinetic Friction> Static Friction> Newton Law of Gravity> Kepler Third Law> Gravitational Acceleration> Hooke Law> Elastic Potential Energy> Newton Second Law of Motion> Impulse with Velocity> Impulse with Time> Momentum with Velocity> Momentum with Time...> And Many More »

Unit Conversion Tool is a powerful, award-winning and easy-to-use utility for quick and accurate conversion between almost every possible unit of measure, from one system to another.