MailClark - The Slack bot for external communications
Hiver - Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates
OneBar - AI-powered Q&A knowledge base for Slack teams
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
Alert.email - Get your important emails delivered to a Slack channel
Clubble.io - Answer emails via Slack.