Sponsored API:

• Shutterstock — https://developers.shutterstock.com

Other potential API's to use in your project:

• Twitter — https://dev.twitter.com/overview/documentation
• Twilio —https://www.twilio.com/docs
• SendGrid — http://sendgrid.com/developers
• Foursquare — https://developer.foursquare.com/
• DuckDuckGo — https://duckduckgo.com/api
• Mashery — http://developer.mashery.com/apis
• Digital Ocean — https://developers.digitalocean.com/