GetNotify - GetNotify is a free email tracking software solution.
WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
ReadNotify - ReadNotify enables the user to know when email is sent and the reciever reads the email.
NEWOLDSTAMP - Email signature generator
Bananatag - Find out what happens to your emails after you press send! Add email tracking, attachment tracking, email scheduling and templates to your daily emails.
Sigstr - Email signature marketing