Creating MS Office docs without MS Office installed for .net

http://code.google.com/p/excellibrary/  for excel



For Java,
http://poi.apache.org/




For Word, we have purchased some API from Aspose, but ours is the Java version of course. You would have to purchase the .NET version.



www.aspose.com



For PDF, we use iText currently.



http://itextpdf.com/