Open Source Webex Alternatives

Mattermost is an open core, self-hosted collaboration platform covering chat, workflow automation, voice calling, screen sharing and AI integration. Teams that cannot put mission-critical conversations on somebody else's servers get the same daily tools while keeping custody of every message.

The platform is written in Go and React, runs as a single Linux binary and relies on PostgreSQL, which keeps the operational surface small for whoever ends up running it. A newly compiled version is released under an MIT license every month on the sixteenth, so upgrades arrive on a predictable rhythm rather than at random.

Deployment and access follow several documented routes.

• Self-hosted install: a working instance in minutes via Docker, Ubuntu or a tar archive, with further guides for other environments.
• Native clients: desktop and mobile apps sit alongside the web interface.
• Developer setup: a separate guide covers building from source for anyone writing code for the platform.
• Extensibility: integrations can be built with APIs, webhooks, slash commands, Apps and plugins.
• Security bulletins: a mailing list carries notice of critical security releases to operators.

This repository is the primary source for core development on the platform, and contributors are pointed at a contribution guide and community channels before opening a pull request. Mattermost fits engineering and operations groups whose requirements start with running the whole stack themselves.

Jitsi Meet lets an organization deploy video conferencing instead of subscribing to it. Meetings run in any current browser, and on the free public instance a Google, Facebook or GitHub account is all it takes to start one, which removes most of the friction in getting several people onto the same call.

The project is a set of components rather than one application. Web and native SDKs exist for building conferencing into other products, and mobile apps are published for Android on both Google Play and F-Droid and for iOS on the App Store, with open beta channels for anyone who wants features early.

The meeting itself covers what most teams expect from a call.

• HD audio and video: video quality is the stated focus of the platform.
• Content sharing: screens and content shared with everyone in the room.
• Chat: room chat with private conversations running alongside it.
• Polls, reactions and raised hands: lightweight signals that keep larger meetings orderly.
• Virtual backgrounds: background replacement handled in the client.

Running your own installation is documented in the handbook, with Debian packages and a Docker setup provided and a from-source build available to advanced users. Security is documented at length, including a whitepaper on the end-to-end encryption implementation. For teams that want their own branding without operating the infrastructure, 8x8 offers Jitsi as a Service on the same technology.

Wire is a secure messenger aimed at organizations, and the whole of it is published: the mobile, desktop, and web clients, the encryption layer, the audio and video stack, and the server that ties them together. A team that needs to audit what its messaging tool does, or run the backend itself, can do both.

Each piece is written in the language its job calls for. Core Crypto, which holds the Axolotl protocol implementation along with the supporting cryptographic and utility libraries, is Rust cross-compiled for iOS, Android, and WebAssembly. The audio, video, and signaling library is ANSI C and C++, cross-compiled the same way, with Java and Objective-C wrappers for the mobile platforms. Protocol buffer definitions shared by every client govern both client-to-client and backend communication.

The server splits into services along the lines of what each one owns.

• brig: accounts.
• galley: conversations and teams.
• gundeck: the push notification hub.
• cannon: WebSocket push notifications.
• cargohold: storage for images, files, and other assets.
• spar: single sign-on.
• nginz: the public API reverse proxy, an Nginx build carrying a custom authorization module.

Self-hosting is documented for Kubernetes, with Helm charts in the repository and mirrored for use through a chart repository. Contributions require signing a contributor agreement and are limited to bug fixes and code improvements, since features and interface changes are decided by the Wire team. Translations are crowdsourced on Crowdin, and privacy and security whitepapers document the algorithms and protocols in detail.