I will just leave you an amazing link to freely available sofware and resources for industrial and businesses use.  You may find anything from calculators to online courses among this collection of over 2500 free tools.

It is in Spanish but it links to a number of pages in English and it is just one of the best free collection of free online resources I have ever come across.  It is definitively worth a visit, perhaps with the help of an online translator.

I thouroughly recommend it.

http://todoproductividad.blogspot.com/2009/01/todo-para-facilitar-el-clculo-revisin_02.html

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