Nova Inbox - Personalize emails in seconds, right from your inbox
Email Signature Generator by cloudHQ - Free email signatures with logo, video, social icons & more!
Gmail Mail Merge - Send personalized emails with attachments
WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
InboxSDK - First usable API to write Gmail Apps for 1B active users
Mailcastr - Create email signature that tells when your email is read.✉️