
Centrifugo
Real-Time Data Sync
Open source scalable real-time messaging server supporting WebSockets and SSE with built-in presence and history features.

Real-Time Data Sync
Open source scalable real-time messaging server supporting WebSockets and SSE with built-in presence and history features.

Backend-as-a-Service
Open-source game server from Heroic Labs providing social, real-time, and competitive features.
Price$600+ / month
Starting price: above the category median.
Communication APIs
Open protocol and reference implementation for real-time communications using Server-Sent Events for push updates.
UI Component Libraries
Phoenix LiveView enables rich, real-time user experiences with server-rendered HTML.
Real-Time Data Sync
End-to-end digital banking for community banks and credit unions: mobile banking, account opening, loan apps, and statements—plus 150+ integrations.

Real-Time Analytics
Open-source Python-native stream processing framework for real-time data workloads.
Database
Open source document database with built-in real-time change notifications making it easy to build reactive applications.

Real-Time Data Sync
Sync layer for building local-first applications with Postgres providing real-time sync between cloud and local databases.

Real-Time Data Sync
Peer-to-peer shared data types library enabling real-time collaborative applications with CRDTs.

Developer APIs
Open-source web framework for building real-time applications and REST APIs using JavaScript or TypeScript.