The Hubspot Ruby SDK by Reinier de Lange allows interaction with various APIs, aiming to facilitate implementation of marketing and sales features into applications. Developers need Rails 3 to install as a Gemfile to start integration. Available configuration and usage.
Last month, GraphEffect announced an API that allows multiple parties/companies to collaborate on projects using their own marketing/collaboration tools. Now, GraphEffect has launched another platform, Shift.com, that empowers applications to communicate with each other.