There are a lot of spreadsheet options available. Many corporations supply a copy of Microsoft Excel. However, if this is not the case, there are many alternatives as follows:
- Google Docs: http://sheets.google.com/
- Open Office: http://www.openoffice.org/
- Libre Office: http://www.libreoffice.org/
All of these options are free to use and popular enough that support and documentation are readily available.