SignMyEmails - Everything you need for an amazing Html Email Signature.
DottedSign - The Best E-Signature Solution for Your Business
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.
Signature Maker - Signature Maker helps you create digital signature online. Signature creator is a simple, fast and free tool for making custom electronic/email/font signature.
LibreSign - O LibreSign (assinatura eletrônica) permite que documentos sejam assinados de forma segura e com validade jurídica.