Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Mobbin - Latest mobile design patterns & elements library
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
pttrns - iPhone and iPad user interface patterns
Plivo - Plivo simplifies your customer engagement.
Page Flows - User flow design inspiration for mobile & desktop