https://www.theverge.com/2017/10/24/16534238/google-gmail-native-add-ons

Earlier this year, Google announced it would allow add-ons for Gmail, and the time has finally come. Launching today, add-ons will allow third-party developers to integrate their services with Gmail directly. The first partners include Asana, Trello, DialPad, Intuit QuickBooks, and Wrike.

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The addition will help enterprise users save a bit of time by not requiring them switch apps constantly. A DocuSign add-on is coming soon, which should be pretty helpful. Right now, Google has only added business-facing add-ons, and it’s unclear when more consumer-facing companies will be able to take advantage of the new Gmail capabilities.