What? Mathmaster.org - a simple free site to generate math worksheets
Why? The Mathmaster.org is a free resource for teachers and parents. You can make an unlimited number of printable math worksheets for children.
Who? parents and teachers
How? Just visit the site and click on any of the worksheet generators to create worksheets.
Diff? What makes this site unique is that the level of control and flexibility when you generate these worksheets.
What? kanakku is Web 2.0 application that is a combination of a spreadsheet and a calculator. It was designed as a free online productivity app.
Why? Unlike other productivity apps you do not have to register, pay a fee, or worry about your edits being tracked. kanakku is free.
Who? kanakku was developed by Kumaresh Rajan.
How? kanakku was designed using ICEfaces 1.8.1 and J2EE 1.6.
Mathmaster 
kanakku spreadsheet calculator