1.novuhq / novuThe open-source communication infrastructure for agents and productsnotificationscommunicationemailsmspush-notificationstransactional+9 moreTypeScriptOther license40K total4.5K forks+1,603 starsfrom 38,644 · score 7.38
2.dittofeed / dittofeedOpen-source customer engagement. Automate transactional and marketing messages across email, SMS, mobile push, WhatsApp, Slack, and more 📨open-sourcetypescriptjavasciptcustomer-engagementcustomer-segmentationemail-notification+14 moreTypeScriptMIT3K total423 forks+304 starsfrom 2,733 · score 5.72
3.invertase / react-native-firebase🔥 A well-tested feature-rich modular Firebase implementation for React Native. Supports both iOS & Android platforms for all Firebase services.firebaseanalyticsandroidiosdatabasepush-notifications+14 moreTypeScriptOther license12K total2.3K forks+106 starsfrom 12,219 · score 4.67