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TechInfo is a small free program that you can download here. It is an invaluable aid to doing problems in chemistry, physics and mathematics. Below are some screenshots so you can get a feel for all the things this program will do.

It has tables of all the need-to-know physical constants:

There is a complete periodic table with information about all the elements:

It includes a page of math formulas of all kinds:

Convert any common unit to any other:

The program does all this, and much more. It's very handy to have on your computer or laptop.
Get TechInfo here (716k, zipped ... right-click and choose 'save target as')

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