The Help Scout Node.js SDK by Segment access the API features of creating a new client, returning list of mailboxes, and displaying list of conversations. By Calvin French-Owen under MIT license available on GitHub.
Campaigner, leading email marketing services provider, has launched the Campaigner Elements API. The Elements API is intended to be integrated with analytics platforms to gain greater insight into subscriber behavior. Creating targets for email blasts is step one. The Elements API makes step two easier: narrowing focus to potential customers.