Right Inbox - Schedule Emails in Gmail To Be Sent Later
Slack Jira Integration - Easily keep issues moving right from Slack
Recurrr - Send recurring emails
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
FollowUpThen - The simplest way to schedule an email reminder
Sortd for Slack - Get Trello-style project boards right in your Slack!