Different versions of spreadsheet packages?
There are many spreadsheet versions and packages out on the internet, you can find them free to download and some you will have to pay depending on what shops you can find.
Microsoft Excel - different versions, have to pay for but can be part of certain office packages
Libreoffice - many different versions can be found and free to downlaod
Gnome Spreadsheet Software- Free to download and easy to use, part of the Gnumeric office package