Twilio - Brings voice and messaging to your web and mobile applications.
PushEngage - Personalized Browser Push Notifications.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Truepush - Unleash limitless possibilities with Truepush and save up to $600 monthly. Free up to 10K Subscribers on all features.
Sinch - Sinch is a powerful voice and messaging SDK that lets you bring your apps to life with VoIP and...
Gotify - a simple self-hosted server for sending and receiving messages