Dropbox - Online Sync and File Sharing
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Google Drive - Access and sync your files anywhere
Plivo - Plivo simplifies your customer engagement.