Open Office.org Calc
Apache OpenOffice Calc is the spreadsheet component of the Apache OpenOffice software package.
Calc is similar to Microsoft Excel, with a roughly equivalent range of features. Calc is capable of opening and saving most spreadsheets in Microsoft Excel's file format. It provides a number of features not present in Excel, including a system that automatically defines series for graphing based on the layout of the user's data. Calc is also capable of writing spreadsheets directly as PDF files.
The default file format for OpenOffice.org Calc (versions 2.x and 3.x) can be set to either Microsoft Excel's native file format or the international standard OpenDocument Format (ODF) ISO/IEC 26300:2006. Calc also supports a wide range of other file formats, for both opening and saving files, such as CSV, HTML, SXC, DBF, DIF, UOF, SLK, SDC and others.
As with the entire OpenOffice.org suite, Calc can be used across a variety of platforms, including Mac OS X, Microsoft Windows, Linux, FreeBSD and Solaris. Available under the ApacheV2 license, Calc is open source software.
Read more about Open Office.org Calc: Special Capabilities, Missing Features, Pivot Table, In Comparison To Microsoft Excel
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