One of the very powerful capabilities in PowerApps is that you can easily build applications that incorporate data from many data sources. Included with PowerApps are dozens and dozens of connectors, however at times it is hard to quickly know all the options that you have available to create these applications and what the data is coming from. We are continuosly imprivng the documentation and samples that we have but I figure I could share a draft of some documentation so you can share ideas on how to improve it and what would you like to see.
[Update] Now updated to include Triggers supported for Microsoft Flow.
[Update 2016-11-30 - Updated to include GoToMeeting and FreshDesk]
[Update 2017-01-05 - Updated to include Buffer, DocuSign, GoToTraining, Harvest, OneNote, SurveyMonkey and TypeForm.] Also now available the Spanish draft.
[Update 2017-02-09 - Updated to include BitBucket, DB2, Eventbrite, File System, Gmail, GoToWebinar, HelloSign, Informix, LUIS, Outlook Tasks, Stripe, UserVoices.]
You can download the PowerApps Connector Reference here in PDF format.
You can download the Spanish version PowerApps Connector Reference in Spanish here in PDF format.
Please share your feedback so we can keep improving.
Below is an example on the Wunderlist Connector. You can see the list of operations that are exposed, and as you click them you will get the details on the parameters, the return types, and more.