AWS Amplify Admin UI - Firebase from AWS, but much better
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.
Bobby - Keep track of your subscriptions
Truepush - Unleash limitless possibilities with Truepush and save up to $600 monthly. Free up to 10K Subscribers on all features.
Digger - Build on AWS without having to learn it, no-code DevOps
PushCrew - Push Notifications for Websites