1.NPOI
Npoi is the. NET version of the POI project. Poi is an open source Java program that reads and writes Microsoft OLE2 component documents such as Excel, Word, and so on. With Npoi, you can read and write Word/excel documents on a machine that does not have Office installed or the appropriate environment.
http://npoi.codeplex.com/
Http://www.cnblogs.com/tonyqus/archive/2009/04/12/1434209.html
2.EPPlus
Summary: Epplus is an open source component that can read and write Excel 2007/2010 files using the Open Office XML (Xlsx) file format
Function: Support for import and export of Excel documents, chart (basic can be achieved by Excel) printing Http://epplus.codeplex.com/3.DocXDocX is a very intuitive and simple way to operate Word 2007/ 2010 file is lightweight. NET components. It's very fast and doesn't need to install Microsoft Office software.
The current version of the Docx component is V1.0.0.12, and the main features are:
1. Support to insert, delete and replace text in files, support all text formatting, such as font, underline, highlight, etc.
2. Supports inserting pictures, hyperlinks, tables, headers and footers, and custom attributes.
3. Support a chain-like notation similar to jquery, very convenient for programming development
http://docx.codeplex.com/
. Net Office Open Source components