Boomerang Respondable - Write perfect emails with Artificial Intelligence
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
Mailbutler - Mailbutler adds lacking functionality to email clients and increases your productivity
Slinky - Your slack links — organized!
Boomerang for Gmail - Boomerang for Gmail is a Firefox / Chrome plugin that lets you take control of when you send and receive email messages.
Lurchr - Saves all your Slack links, so you can focus on work