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A large and extensive library of excel calculation sheets and a few standalone programs. The site is not very intuitive to navigation. Refer to Chemical Engineering Ref's curated list of handy calculators.
Wolfram|Alpha helps you to get knowledge and answers by doing dynamic computations based on a vast collection of built-in data, algorithms and methods. It covers wide ranges of subjects including chemistry, food & nutrition, life sciences, engineering, money & finance, socioeconomic data, computational science.
Chemsketch is an all-purpose chemical drawing and graphics software. Use templates or free-hand. Click and draw molecules, ions, stereobonds, text, polygons, arrows, lab aparatus, etc. Automatic calculation of MW and formula. See estimates of density, refractive index, molar volume, etc.
MarvinSketch allows users to quickly draw molecules through basic functions on the GUI and advanced functionalities such as sprout drawing, customisable shortcuts, abbreviated groups, default and user-defined templates and context-sensitive popup menus.
It is easy-to-use and has everything you need when you calculate or analyze your formula. Sicyon is all-in-one type of software consisting of an expression calculator, constants database, units converter, and solver.