WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
DocuSign - Try DocuSign's interactive signing demo now! Send yourself an electronic document to digitally sign using our e-signature service.
MySignature - MySignature is FREE Email Signature Generator that helps to create Professional Signatures for major email clients such as Outlook, Gmail...
RightSignature - Contracts, NDAs, forms, you name it — all signed online in minutes
Sigstr - Email signature marketing
Scrive - Scrive is a solution to e-sign documents via email, SMS, tablet or integrated into a webpage.