TL:DR; .
.NET component that sends and receives faxes using a fax modem. It has been developed in c-sharp and source code can be purchased.
Manco .NET Licensing System is powerful licensing and copy protection tools for .NET Windows Forms, WPF, and ASP.NET applications, controls and components. Strong encryption. Flexible license file content. Creates encrypted code and data.
Aspose.Editor is a Word Processor Control for Windows Forms that offers; Open, edit&save WordML documents, Text formatting, Pre-built dialogs, Zoom, Modify documents using Range, Selection etc. classes, Generate page thumbnail, Drag&drop to Forms
Docotic.Pdf is a .NET PDF library for reading and writing PDF documents. You can also modify PDF documents, merge PDF files, add images to PDF, extract PDF text, password-protect PDF files, add PDF annotations. Create PDF/A files.