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ClosedXML makes it easier for developers to create Excel 2007/2010 files. It provides a nice object oriented way to manipulate the files (similar to VBA) without dealing with the hassles of XML Documents. It can be used by any .NET language like C# and Visual Basic (VB).
ExtremeML adds new power to the OpenXML SDK 2.0, enabling packages to be created and edited via an intuitive object model and freeing developers from the burden of implementing the low-level detail of OpenXML.
Images2OpenXML its an application that uses Office 2007 OCR API to convert images generated by scanned documents to OpenXML documents. There's no need of third party applications anymore to convert documents, you can use this tool for free. It was developed with C#.