The Cronofy Ruby SDK by Cronofy allows API communication to access calendar syncing data. It is useful to integrate with Google, iCloud, Exchange, Office 365, and Outlook. Installation and usage available. See on GitHub how to create a client to make API calls.
Our API directory now includes 38 scheduling APIs. The newest is the T Dispatch Passengers API. The most popular, in terms of mashups, is the Buffer API. We list 1 Buffer mashup. Below you'll find some more stats from the directory, including the entire list of scheduling APIs.