Inbox Creature - A super cute virtual pet, delivered right to your inbox.
Twilio - Brings voice and messaging to your web and mobile applications.
Mailtrack.io - The best email tracking solution I've found. Free
Plivo - Plivo simplifies your customer engagement.
Tamagotchi Pix - The latest Tamagotchi now with a camera
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.