Open Peeps - A hand-drawn illustration library.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Control Illustrations - 108 free flat illustrations with customizable characters
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Blush - Illustrations for everyone
Plivo - Plivo simplifies your customer engagement.