Messaging GitHub Repositories (2026) · Open Source Tools

Unofficial Signal client for the terminal, built for tmux and SSH

DM without looking like you're DMing — a discreet Agent CLI-style TUI messenger.

Time-series database and pub/sub messaging server for IoT and real-time devices, in Go: an embeddable storage engine with TTLs, wildcard topics and encryption, and a clustered server over gRPC, TCP and WebSocket with replication and rolling upgrades.

Element for Nextcloud

Silverback is a message bus and broker integration library for .NET. It is designed to simplify event-driven architectures and asynchronous messaging, with first-class support for Apache Kafka and MQTT.

Spring Cloud event bus

Framework for automated integration tests with focus on message-based applications

RocketMQ Clients - Collection of Client Bindings for Apache RocketMQ

SDK monorepo for the Ethora chat / messaging platform. (1) Pick an SDK for your frontend stack. (2) Integrate manually or with ethora-setup. (3) Optionally configure app settings, deploy AI agents etc. Server: ethora.com cloud (free), self-hosted (AWS, Docker, Helm, Cloudron) or a managed dedicated server with SLA. All options: ethora.com/get

Apache Pulsar - distributed pub-sub messaging system

KaleidoFoundry is a java 8+ foundation providing abstraction layer for : configuration, caching, i18n, messaging… Modules are plugeable legos, choosing your provider, that you can extend