* [NATS Server v2.14.2](https://github.com/nats-io/nats-server) – High-performance messaging server for cloud-native applications and distributed systems.

* [HAVEN v3.21.0](https://github.com/ancsemi/Haven) – Self-hosted private chat server that runs on your machine, offering voice, channels, invite codes, and file sharing.

* [Centrifugo v6.8.1](https://github.com/centrifugal/centrifugo) – Scalable real-time messaging server supporting multiple transport protocols for building interactive applications.

* [Harper v5.0.25](https://github.com/HarperFast/harper) – Node.js unified in-memory platform combining database, cache, application logic, and messaging for microsecond-level performance.

* [Ethora SDK Monorepo v26.06](https://github.com/dappros/ethora) – Chat, AI, and messaging SDK platform to add real-time messaging, AI bots, wallets, and backend services to apps.