Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
OneSignal - Customer engagement platform used by over 1 million developers and marketers; the fastest and most reliable way to send mobile and web push notifications, in-app messages, emails, and SMS.
AWS Amplify - JavaScript library for app development using cloud services
Truepush - Unleash limitless possibilities with Truepush and save up to $600 monthly. Free up to 10K Subscribers on all features.
AnyPresence - AnyPresence is an Enterprise Backend as a Service for mobile app development and API augmentation.
PushCrew - Push Notifications for Websites