Google+Docs+Spreadsheet

The spreadsheet is very similar to Microsoft Excel. A lot of the key functions are there, including the sigma key, which computes equations. The spreadsheet doesn't have all the features excel has, but it is pretty close, but bear in mind it is free. **Also, don't forget that** **there is** **one copy and every copy will change if one person edits something.** The excel portion looks something like this. ..
 * Google Docs Spreadsheet**