Dynamically Personalized Emails by QGraph - Hyper-personalized emails for E-commerce
If No Reply - Simple email automation that works for Gmail
InboxSDK - First usable API to write Gmail Apps for 1B active users
Assistant.to - GoToMeeting. Put your GoToMeeting link in the Assistant. to "Location" field. Once the recipient selects a time, you will both receive an invite with a unique GoToMeeting link.
Nova Inbox - Personalize emails in seconds, right from your inbox
SendLater - Email scheduler for Mac Mail.