We're excited to share a new extension for Commerce with you today: Mailchimp!
It pretty much does what you expect it to do: allows you to ask your customers if they want to sign up to your Mailchimp mailing list when they place an order.
All you have to do is install the extension, add your API Key to the module configuration and select the list (audience) you'd like to use. You'll also need to add some markup to your checkout templates.
Special shoutout to Digital Penguin for building this extension!