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Nebu - Self-hosted Matrix Chat

Self-hosted Matrix chat - your data, your rules.

Nebu (short for Nebuchadnezzar, the ship of the free from The Matrix) is an enterprise-grade, Matrix Client-Server API compatible chat server. Apache 2.0 licensed. No federation. Horizontally scalable. Designed to replace Slack/Teams with full data sovereignty.

Why Nebu?

Matrix-compatible

Nebu implements the Matrix Client-Server API - compatible with any Matrix client (Element Web, FluffyChat, Cinny, and others). Your users keep their preferred clients. Your team is not locked into a proprietary interface.

Data sovereignty - your data, your rules

Nebu runs entirely on your infrastructure. No SaaS vendor, no external data routing, no surprise privacy policy changes. You control the server, the database, and the keys. Full GDPR compliance is built in, not bolted on.

No Redis, no NATS, no Kafka

Most self-hosted chat servers drag in a fleet of infrastructure dependencies. Nebu uses Elixir/OTP's built-in ETS for caching and pg Process Groups for pub/sub - no Redis, no NATS, no Kafka. Fewer moving parts. Simpler operations. Lower cost.

Apache 2.0 - truly open

Nebu is released under the Apache 2.0 license. Use it, fork it, embed it in your product. No "open core" licensing, no paid enterprise tier for basic features.

Tech Stack

Nebu is built on a proven combination of fast, reliable, and battle-tested technologies:

LayerTechnology
API GatewayGo 1.26+ - fast, stateless, horizontally scalable
Messaging CoreElixir/OTP 1.19+ - actor model, crash-resilient GenServers
DatabasePostgreSQL 16+ - append-only event log, no ORM magic
Clusteringlibcluster + Horde - distributed GenServer registry
AuthOIDC-only (Dex, Keycloak, or any OIDC provider)
MediaGo media gateway - S3-compatible, thumbnail generation

No Redis. No NATS. No Kafka. No surprises.

Get Started

Ready to deploy Nebu?

Source Code

The source code is available at gitlab.opencode.de. Apache 2.0 - contributions welcome.