The MyNewsletterBuilder Ruby SDK by MyNewsletter integrates email marketing features into applications. Besides the file can be downloaded from the site, additional components are available at https://rubygems.org/gems/mynewsletterbuilder
TipTap Lab uses psychology to better understand existing and potential customers. The TipTap Lab API allows third party apps to take advantage of such psychology by building profiles for those that interact with the app and acting accordingly. Whether an app developer wants to personalize an online experience or pair up users with similar interests, the TipTap Lab API examines the abstract, subconscious layer of users to better and enable a developer to accomplish goals.