Mailcastr - Create email signature that tells when your email is read.✉️
Email Signature Generator by cloudHQ - Free email signatures with logo, video, social icons & more!
Ugly Email for FireFox - Get back your email privacy, block email tracking
PixelBlock - Block email open tracking inside of Gmail
WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
Mailintel - Analytics and reporting dashboard for transactional emails.