Apache OpenOffice is a free download at http://www.openoffice.org
It works on Windows, Mac and Linux.
The OpenOffice Suite is similar to MS Office
The OpenOffice suite includes:
Writer ( Word Processor ) - Word
Calc ( Spreadsheet ) - Excel
Impress ( Presentation ) - PowerPoint
Base ( Database ) - Access
Draw ( Vector Drawing ) - Office Drawing
Math ( Formula Editor ) - Equation Editor
This tutorial shows the user interface of Calc 4. The items include, toolbars, menus, SideBar, cells, split, What Is This, and many other items.
This tutorial uses OpenOffice Calc 4.0.1 running on Windows 8.1