WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
Mailcastr - Create email signature that tells when your email is read.✉️
MySignature - MySignature is FREE Email Signature Generator that helps to create Professional Signatures for major email clients such as Outlook, Gmail...
Mailbum - Email signatures without the fuss
Sigstr - Email signature marketing
Signature Lab - Create a beautifully designed email signature in seconds.