WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
eSignLive - E-SignLive that is also called as e-SignLive by Silanis that will make you able to enjoy the e-signature and electronic signature from any part of the word.
MySignature - MySignature is FREE Email Signature Generator that helps to create Professional Signatures for major email clients such as Outlook, Gmail...
HelloSign - eSignatures Simplified. The Most Powerful Platform for Your Business Agreements.
Sigstr - Email signature marketing
Sertifi - On-Demand eSignature Provider