SignatureSatori - A Solution for central e-mail signature management for Google Apps.
Signature.email - A powerful visual drag and drop email signature generator paired with the easiest way to maintain consistency for your whole team.
WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
MySignature - MySignature is FREE Email Signature Generator that helps to create Professional Signatures for major email clients such as Outlook, Gmail...
Signature Hound - Email signatures made easy.
NEWOLDSTAMP - Email signature generator