This is not a must have seeing how most people would not use it but for those that need more in a way of a calculator for computing math problems Microsoft has a free program called Microsoft Mathematics. It even has a nice conversion tool.This would be a great addition for students to have on their computer.

http://www.microsoft.com/downloads/en/details.aspx?FamilyID=9caca722-5235-401c-8d3f-9e242b794c3a

Thanks for the link Doc. I just went through it and noticed there are some that are against this type of software. I am not saying this should replace teaching children to solve math equations by using their brain. This is a more advance tool for dumb people like me that would spend half a day trying to figure out what this tool can do in seconds. If you do not think this is a good idea then you probably are against anything that helps with productivity. We live in a different age. I do not like that children are encouraged to take calculators to class but times have changed and methods of doing things have changed whether we like it or not.

LibreOffice

http://www.libreoffice.org/

Is a good one, as I wrote about it also. http://drjbhl.joeuser.com/article/404347/Jarte_42_and_LibreOffice_33

If only I had this one yesterday!

Excellent Captinmoonlight!

That's cause Doc is really 'Doctor Know'. Its his secret identity so don't tell nobody.

j/k Doc. You da man.