SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
SEOmator - SEO website analysis & audit tool
MySignature - MySignature is FREE Email Signature Generator that helps to create Professional Signatures for major email clients such as Outlook, Gmail...
Pro Rank Tracker - Rank tracking & reporting software solution
Sigstr - Email signature marketing