* [NATS Server v2.15.0](https://github.com/nats-io/nats-server) – High-performance messaging server for cloud-native applications and distributed systems.

* [HAVEN v4.21.0](https://github.com/ancsemi/Haven) – Self-hosted private chat server that runs on your machine, offering voice, channels, invite codes, and file sharing.

* [Bunny 3.4.0](https://github.com/ruby-amqp/bunny) – Ruby RabbitMQ client focusing on ease of use, full feature support, and lightweight dependencies.

* [NATS: Pure Ruby Client v2.7.0](https://github.com/nats-io/nats-pure.rb) – Pure Ruby, thread-safe client for the NATS messaging system, supporting subscriptions, publishing, requests, and JetStream consumption.

* [Harper v5.3.0](https://github.com/HarperFast/harper) – Node.js unified in-memory platform combining database, cache, application logic, and messaging for microsecond-level performance.

* [Centrifugo v6.9.7](https://github.com/centrifugal/centrifugo) – Scalable real-time messaging server supporting multiple transport protocols for building interactive applications.

* [RabbitMQ v4.3.6](https://github.com/rabbitmq/rabbitmq-server) – Feature-rich multi-protocol messaging and streaming broker supporting various protocols.

* [OpenIM v3.8.3-patch.17](https://github.com/openimsdk/open-im-server) – OpenIM provides a complete set of tools for integrating instant messaging into applications.

* [Sharkord v0.0.26](https://github.com/Sharkord/sharkord) – Lightweight self-hosted real-time communication platform providing voice, video, text, and file sharing with full data control.

* [Ethora SDK Monorepo v26.10](https://github.com/dappros/ethora) – Chat, AI, and messaging SDK platform to add real-time messaging, AI bots, wallets, and backend services to apps.

* [Qpid Proton 0.41.1-rc1](https://github.com/apache/qpid-proton) – High-performance, lightweight AMQP 1.0 messaging library with a reactive API, portable C core, and support for brokers, routers, and secure communication.