Realtime Collaboration Resources

Contents

• Papers
• Talks
• Articles
• Discussions
• Sources
• Demos
• Examples in real world

Papers

• A Conflict-Free Replicated JSON Datatype
• Merging OT and CRDT Algorithms
• Near Real-Time Peer-to-Peer Shared Editing on Extensible Data Types (about y-js)
• Scalable XML Collaborative Editing with Undo
• An Algorithm for Selective Undo of Any Operation in Collaborative Applications
• Real time group editors without Operational Transformation (WOOT)
• A comprehensive study of Convergent and Commutative Replicated Data Types
• Differential Synchronization

Talks

• Concurrent Data & OT Alternatives
• How we built Synchrony, the engine behind collaborative editing in Confluence
• Conflict Resolution for Eventual Consistency - Martin Kleppmann
• (Russian) Виктор Грищенко — Swarm: синхронизируем рой устройств
• Strong Eventual Consistency and Conflict-free Replicated Data Types by Marc Shapiro
• Differential Synchronization
• UIST 2015 - Webstrates: Shareable Dynamic Media
• Codestrates: Literate Computing with Webstrates

Articles

• Understanding and Applying Operational Transformation
• CRDT Notes - Excerpts collected from papers and articles published on the Web
• A simple approach to building realtime collaborative text editor - Nice explanation of CRDTs
• Data Laced with History: Causal Trees & Operational CRDTs
• (Russian) Рождение, жизнь и смерть Волны - причины почему умер Google Wave

Discussions

• A Conflict-Free Replicated JSON Datatype on Hacker News
• Apache Wave on Hacker News
• Automerge on Hacker News
• ShareJS Google Group

Sources

• https://github.com/share/sharedb [JavaScript] - Realtime database backend based on Operational Transformation of JSON documents, uses MongoDB and Redis
• https://github.com/rizzoma [CoffeeScript/JavaScript] - Google Wave clone based on ShareDB
• https://github.com/gritzko/swarm [JavaScript] - CRDT implementation
• https://github.com/gulf [JavaScript] - Operational transformation control layer with several bindings to contenteditable, quill editor, socialcalc. Though the author says he found something better than OT - CRDT
• https://github.com/dmitryuv/atext-changeset [JavaScript] - A library for building collaborative rich-text editors using operational transformation. It's based on easysync spec from the Etherpad-Lite project
• https://github.com/goodow/realtime-store [Java] - Google Docs–style collaboration via the use of operational transforms. Documents are made of 4 types of collaborative elements: String, Lists, Maps and Custom objects. A Goodow Realtime Store collaborative document can have as many of these collaborative elements as they need
• https://github.com/Operational-Transformation/ot.js [JavaScript] - Operational Transformation Implementation (for text)
• https://github.com/automerge/automerge [JavaScript] - Automerge is a library of data structures for building collaborative applications in JavaScript
• https://github.com/automerge/trellis [JavaScript] - Trellis is a Trello clone built as an Electron desktop application. We built Trellis to demo MPL, a distributed persistence library that allows developers to build collaborative applications that are realtime, offline, and network partition tolerant. Uses automerge library
• https://github.com/Webstrates/Webstrates [JavaScript] - With Webstrates, webpages become collaboratively editable in real-time. Changes to the Document Object Model (DOM) of a page persist and are synchronised to all connected clients of the same page using Operational Transformation through ShareDB.
• https://github.com/Webstrates/Codestrates [JavaSctipt] - Codestrates is a literate computing approach to developing interactive software inspired by interactive notebooks such as Jupyter notebook. However, in Codestrates, real-time collaboration is built in, it is possible to create stand-alone applications with persistent state, and to reprogram the functionality of the environment it self.
• https://github.com/goodow/realtime-operation
• https://github.com/marcelklehr/changesets
• https://github.com/hivejs
• https://github.com/marcelklehr/warp
• https://github.com/marcelklehr/dom-ot
• https://github.com/y-js/yjs
• https://github.com/kbadk/json0-ot-diff
• https://github.com/usecanvas
• https://github.com/Evercoder
• https://github.com/Ramonlord/moqups
• https://github.com/apache/incubator-wave
• https://github.com/rudi-c/alchemy-book

Demos

• http://alchemy.digitalfreepen.com
• http://realtimeplayground.goodow.com
• https://operational-transformation.github.io/visualization.html - Operational Transformation Visualization
• http://codestrates.org/ - you can create a codestrate and edit HTML/CSS/JavaScript collaboratively

Examples in real world

• https://drive.google.com
• https://colab.research.google.com
• https://datastudio.google.com
• https://trello.com
• https://www.dropbox.com/paper
• https://www.figma.com
• https://rizzoma.com
• https://moqups.com
• http://etherpad.org
• https://www.nuclino.com
• https://quip.com
• https://mural.co
• https://realtimeboard.com

Contributions

Have anything in mind that you think would fit in this list? Feel free to send a pull request.