A curated list of things related to the Matrix ecosystem, including software, research, etc. Matrix is an open protocol for secure, decentralized data stores with a focus on communication.

This list hopes to become a good place for finding projects that may not have an obvious category to fit into on the matrix.org website.

• Annotation
• Blogs
• Bots
  • Multi Purpose Bot Platforms
  • Single Purpose Bots
• Bridges
• Clients
• Collaborative Documents
• Collaborative Maps
• Comments
• Encryption
• Factoids
• Research
• SDKs
• Servers
• Social Media
• Testing
• Widgets

• Populus-Viewer - Social annotation of PDFs, powered by Matrix. (Repo, Chat) GPL-3.0 JavaScript
• Matrix Highlight - Matrix-based collaborative web annotation. (Repo, Chat) Apache-2.0 TypeScript

• matrix-blog - A library to interact with a Matrix server in a way that treats it as a backend for a blog. (Repo, Chat) MIT TypeScript

• maubot - A plugin-based Matrix bot system with over 30 plugins for all sorts of things. (Repo, Chat) AGPL-3.0 Python
• opsdroid - A flexible multi-platform chat bot framework with Matrix support including end to end encryption. (Repo, Chat) Apache-2.0 Python

Some bots are quick scripts tailored to a specific purpose.

For a comprehensive list with many more clients along with screenshots, the Matrix clients table is a good resource.

• Element - A glossy client with an emphasis on performance and usability. (Web, iOS, Android) Apache-2.0 TypeScript, Swift, Kotlin
• FluffyChat - Cute instant messaging app for all platforms. (Chat) AGPL-3.0 Flutter
• Ditto - React Native client for iOS and Android. (Chat) GPL-3.0 JavaScript
• Safesupport chatbox - Embeddable Matrix chatbox.
• Fractal - A client for GNOME written in Rust. (Chat) GPL-3.0 Rust

• matrix-notepad - A buggy way to collaborate on text documents using the Matrix protocol. (Repo, Chat) GPL-3.0 JavaScript
• TheBoard - Collaborative whiteboard powered by Matrix. (Repo, Chat) MIT JavaScript
• Collabs - A collections library for collaborative data structures. Apache-2.0 TypeScript
• Matrix CRDT - Integrates CRDTs like Yjs with Matrix for storage and sync. MPL-2.0 TypeScript

• ODIN - Command and Control Information System (C2IS) built on Open Layers, React, and Electron. Uses Matrix in order to replicate the state of the symbols (MIL-STD-2525C) drawn on the map. ODIN is an offline-first application and uses LevelDB to persist state locally. At the lowest level LevelDB operations are replicated. (Repo, Chat) AGPL-3.0 JavaScript

• Cactus Comments - Federated, web-embeddable comment system for the open web built on Matrix. (Repo, Chat) GPL-3.0 Elm, Python

• Olm - Implementation of the Olm and Megolm cryptographic ratchets. Apache-2.0 C++
• pantalaimon - E2EE aware proxy daemon for Matrix clients. (Chat) Apache-2.0 Python

• Matrix Limits - A collection of various limits and related factoids about the Matrix specification and implementations.

Research papers and similar documents studying something related to Matrix.

• Matthew Weidner, Martin Kleppmann, Daniel Hugenroth, Alastair R. Beresford. Key Agreement for Decentralized Secure Group Messaging with Strong Security Guarantees.
• Florian Jacob, Carolin Beer, Norbert Henze, Hannes Hartenstein. Analysis of the Matrix Event Graph Replicated Data Type.

• Florian Jacob, Luca Becker, Jan Grashöfer, Hannes Hartenstein. Matrix Decomposition: Analysis of an Access Control Approach on Transaction-based DAGs without Finality.
• Martin Kleppmann, Heidi Howard. Byzantine Eventual Consistency and the Fundamental Limits of Peer-to-Peer Databases.

• Florian Jacob, Jan Grashöfer, Hannes Hartenstein. A Glimpse of the Matrix: Scalability Issues of a New Message-Oriented Data Synchronization Middleware.
• Matthew Weidner. Group Messaging for Secure Asynchronous Collaboration.
• Quirin Heiler, Richard von Seck, Jonas Jelten. Peer-to-Peer Matrix.

• Katriel Cohn-Gordon, Cas Cremers, Luke Garratt, Jon Millican, Kevin Milner. On Ends-to-Ends Encryption: Asynchronous Group Messaging with Strong Security Guarantees.

• Ksenia Ermoshina, Francesca Musiani, Harry Halpin. End-to-End Encrypted Messaging Protocols: An Overview.

• matrix-rust-sdk - A modular SDK for writing Matrix clients, written in Rust. Implements Matrix E2EE in a separate crate with a sans I/O design. Apache-2.0 Rust
• SimpleMatrixClient - Lightweight, zero dep client library written in TypeScript. MIT TypeScript
• Matrix Client API - A bespoke and well focused SDK for ODIN. Lightweight and well-structured; may be useful for beginners to explore how the Matrix API works. MIT JavaScript

• Synapse - The reference homeserver. (Chat) Apache-2.0 Python
• Dendrite - A second-generation Matrix homeserver written in Go. It intends to provide an efficient, reliable and scalable alternative. (Chat) Apache-2.0 Go
• Conduit - A simple, fast and reliable chat server written in Rust. (Repo, Chat) Apache-2.0 Rust
• hghs - Lightweight Matrix homeserver for special purposes which compiles as a single file with zero dependencies, except NodeJS. MIT TypeScript

• Circles - E2E encrypted social networking built on Matrix. Safe, private sharing for your friends, family, and community. (Repo) AGPL-3.0-only Swift
• MinesTRIX - A privacy focused social media based on Matrix. (Repo) AGPL-3.0-or-later Flutter

• Patience - Full stack integration testing for Matrix clients and servers. (Chat) Apache-2.0 TypeScript

• matrix-widget-api - A widget API abstraction for browsers. (Chat) Apache-2.0 TypeScript
• matrix-widget-debug - Test widget for validating clients and matrix-widget-api. Apache-2.0 JavaScript

Various other directories and lists of Matrix things.

• Try Matrix Now - Comprehensive directory of various Matrix projects.
• Matrix clients table - Thorough list of many more Matrix clients along with screenshots.
• @rodolpheh's awesome-matrix - An earlier effort at assembling awesome Matrix projects.

Contributions welcome! 😄 Read the contribution guidelines first.

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