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Best Open-Source Messaging Software

Software for real‑time text, voice, or video communication.

All (11)Free (3)Open-Source (3)Web (10)Windows (7)Mac (7)Linux (6)iOS (9)Android (9)

Showing 3 products

Signal

Private, end-to-end encrypted messaging.

Encryption ToolsFreeWindows · Mac · Linux +2

novu

Unified notification infrastructure for developers

API ToolsFreemiumWeb

NATS Server

NATS Server

High-Performance server for NATS.io

DevOps & CI/CDFreeWeb · Linux