Open-source software (OSS) is computer software that is available in source code form: the source code and certain other rights normally reserved for copyright holders are provided under a free software license that permits users to study, change, improve and at times also to distribute the software.

Open source software is very often developed in a public, collaborative manner. Open-source software is the most prominent example of open-source development and often compared to (technically defined) user-generated content or (legally defined) open content movements.
{Source : http://en.wikipedia.org}

Open Office Calc


CALC is the spreadsheet program you've always wanted. Newcomers find it intuitive and easy to learn; professional data miners and number crunchers will appreciate the comprehensive range of advanced functions

Advanced DataPilot technology makes it easy to pull in raw data from corporate databases; cross-tabulate, summarise, and convert it into meaningful information.

You are free to use your old Microsoft Excel spreadsheets, or save your work in Excel format for sending to people who are still locked into Microsoft products. If all they want to see is your results, then use Portable Document Format (.pdf) - no need to buy any extra software. Since version 3.0, CALC has been able to read .xlsx files created with Microsoft Office 2007 or Microsoft Office 2008 for Mac OS X.
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