OpenOffice Calc

Calc is an easy to understand spreadsheet program that appeals to novice users and professional data miners and number crunchers alike.

• Create spreadsheets with raw data and use DataPilot technology to cross-tabulate, summarize and convert into meaningful information.
• Provides features not in Excel — Natural language formulas, Intelligent Sum Button, Scenario Manager and Solver allow for data manipulation and easy-to-understand analysis without having to create multiple data charts.
• Export spreadsheets to PDF format for easy file sharing.
• Many features mirror Excel or Lotus 1-2-3 and are familiar to users.
• Fully compatible with Excel formatting. Supports multiple users by sharing their spreadsheets and easily integrating data; avoids editing conflicts.