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Spreadsheets

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Reliable and handy add-ins for MS Excel, Outlook and Word.
http://www.ablebits.com/
Add-in that compares and updates Excel spreadsheets.
http://www.synkronizer.com/
We provide spreadsheet protection, VBA excel security software products and services for Microsoft Excel security, VBA tools and spreadsheet design.
http://www.datasafexl.com/
Welcome to ExcelSentry. We are pleased to announce the release of an Excel 2007 version of ExcelSent.
http://www.excelsentry.com/
ModelSheet Software provides products and services that enhance spreadsheets.We sell customized spreadsheet templates.
http://www.modelsheetsoft.com/
Open source developer-friendly spreadsheet library compatible with Microsoft Excel 2007/2010/2013.
http://www.spreadsheetlight.com/
XL Comparator is a free tool to compare two Excel or CSV spreadsheets without programming Excel macros nor installing software on your computer.
http://www.xlcomparator.net/