Thanks for these. Adding a couple others: * EPPlus for reading or creating Excel spreadsheets without using Excel (such as on a server). http://epplus.codep

Thanks for these. Adding a couple others: * EPPlus for reading or creating Excel spreadsheets without using Excel (such as on a server). http://epplus.codeplex.com/ http://epplus.codeplex.com/ * RTFConverter for parsing RTF. http://www.codeproject.com/Articles/27431/Writing-Your-Own-RTF-Converter http://www.codeproject.com/Articles/27431/Writing-Your-Own-R... These are good enough to drive the decision to use C#/.NET for projects needing these capabilities.