WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
6sense - 6sense is a B2B predictive intelligence engine for marketing and sales.
MySignature - MySignature is FREE Email Signature Generator that helps to create Professional Signatures for major email clients such as Outlook, Gmail...
Leadiro - Seriously Smart & Live B2B Data
Sigstr - Email signature marketing
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.