Aspose.Words is a word processing component that enables .NET applications to read, write & modify Word documents without using MS Word. Other features include document creation, content & formatting manipulation, mail merge, reporting & support of DOCX, DOC, WordML, HTML, XHTML, TXT & PDF formats (requires Aspose.Pdf). It supports 32 & 64 bit operating systems. You can use Aspose.Words with Mono.