Com poucos cliques e de modo simples e fácil, esta aplicação realiza processos de visualização, inclusão, remoção e validação de assinaturas digitais em lotes de documentos que utilizam a Open Packaging Convention (OPC).

DocuSign eSignature services support esigning from within the SharePoint environment. Has a number of integration points into your business. Try this sample.

This is a licensing solution implemented in C# which uses XML and digital signature.

This project aims to provide a C# (CSharp) XAdES signing support library for the .NET framework. Also, it will make XMLDSig API easier, supplying a simple DSL. It will include signing and validation for the standards XMLDSig, XAdES, XAdES-T, XAdES-C, XAdES-BES and XAdES-EPES.

The XmlDSigEx library aims to provide an alternative to the SignedXml classes in the .Net Framework. It addresses some of the shortcomings of the standard types particularly in regards to canonicalisation and the enveloped transform. It is currently under development.