GemBox.Document
.NET Word Library

static void Main()
{
    // Set license key to use GemBox.Document in Free mode.
    ComponentInfo.SetLicense("FREE-LIMITED-KEY");

    // Create a new empty Word file.
    var doc = new DocumentModel();

    // Add a new document content.
    doc.Sections.Add(new Section(doc, new Paragraph(doc, "Hello world!")));

    // Save to DOCX.
    doc.Save("Document.docx");
}