Open-source TeamSpeak alternatives

Mumble is an open-source voice chat program designed for low latency and high audio quality. It is written on top of Qt and Opus and is used by groups, including gaming communities, that want to talk in real time on a server they control.

The software has two parts: the client, called mumble, and the server, called mumble-server, which was formerly known as murmur. The client is available for Windows, Linux, FreeBSD, OpenBSD and macOS, and the server is expected to run anywhere Qt can be installed. General-purpose plugins can add functionality that is not built into the main application, and the interface is translated through the Weblate platform.

Mumble is written in C++, and its licence is listed as non-standard on GitHub, so check the repository for details. Documentation lives on the project website, and the README gives build instructions that vary by branch, with the master branch holding unstable code for a future release.

This repository contains the services and libraries that power the Stoat chat service, whose earlier name Revolt still appears in the project's topics. It is a backend codebase written in Rust, using MongoDB for storage and Redis alongside it. The linked developer site documents the public API for people building on the platform.

The code is organized into core crates and server crates. The core crates cover configuration, the database implementation, file handling with S3 storage and encryption, API models, permission logic, user presence, shared result and error types, and a request coalescing service. On top of these sit a REST API server called delta and a WebSocket events server called bonfire.

Chatto is an open-source chat application for teams and communities that is meant to be free and easy to self-host. The repository contains the chat server, a command-line tool, and a bundled web front end, and the project describes itself as fully featured. It is released under the AGPL-3.0 license.

The topics describe a privacy-first design that is GDPR-compliant, and the application includes voice calls, video calls, and screen sharing in addition to text chat. The repository also hosts related components, including Runling, an independent workflow and agent orchestrator published on npm, and Authling, an identity provider that is expected to move to its own repository.

The README says cloud hosting will be available soon, so self-hosting is the supported route today, with a documentation site and releases for installation. The authors note that Chatto is built with the help of coding agents. It is a young project created in 2026 and suits teams that want an alternative to hosted workplace chat tools.

Sharkord is a self-hosted communication platform that brings the most important Discord-style features to your own infrastructure. It is aimed at small groups who want voice, video, text and screen sharing with privacy, simplicity and full control over their data, and the project notes it is in an alpha stage.

Voice channels use a built-in mediasoup SFU for video and screen sharing, while text channels can be grouped into categories and include threads, replies, reactions, pins and search. Other features include direct messages, roles with per-channel permission overrides, custom emoji, mentions, invites with usage limits, file uploads with storage quotas, and a plugin SDK that extends both server and client.

Sharkord is written in TypeScript on Bun and licensed under MIT. It is distributed as a standalone binary that bundles server and client for Windows, macOS and Linux, and it can also run in Docker. On first launch it prints a secret token that grants owner access and must be kept safe. A live demo is available, and breaking changes are expected during alpha.

Haven is a private chat platform that runs on your own machine and is positioned as an alternative to Discord. The project says there is no cloud, no company account, no telemetry and no paid tier. One person runs the server and everyone else joins with a code, so messages, files and voice never touch anyone else's infrastructure.

Setup takes about a minute: run it in Docker, unzip and start it on Windows with a batch file that installs Node.js if needed, or run a start script on Linux or macOS, then open the HTTPS address on port 3000, register as admin, create a channel and share the invite code. Clients include a desktop app for Windows and Linux with per-app audio sharing, device switching mid-call and the option to run the server itself, a native Android app on Google Play, an iOS app in TestFlight testing, and any browser including on phones. Topics mention voice chat, streaming and mediasoup.

Haven is written in JavaScript on Node.js and licensed under AGPL-3.0. One-click deployments on Zeabur and RepoCloud are offered, and a volunteer-hosted community server is open for anyone who wants to look around first.