HedgeDoc (formerly known as CodiMD) is an open-source, web-based, self-hosted, collaborative markdown editor.

You can use it to easily collaborate on notes, graphs and even presentations in real-time. All you need to do is to share your note-link to your co-workers and they’re ready to go.

Virtual whiteboard for sketching hand-drawn like diagrams.
Collaborative and end-to-end encrypted.

Open Source Notion Alternative

Troop is a real-time collaborative tool that enables group live coding within the same document across multiple computers. Hypothetically Troop can talk to any interpreter that can take input as a string from the command line but it is already configured to work with live coding languages FoxDot, TidalCycles, and SuperCollider.

Gitpod is an open-source Kubernetes application providing fully-baked, collaborative development environments in your browser - powered by VS Code.

Tightly integrated with GitLab, GitHub, and Bitbucket, Gitpod automatically and continuously prebuilds dev environments for all your branches. As a result, team members can instantly start coding with fresh, ephemeral and fully-compiled dev environments - no matter if you are building a new feature, want to fix a bug or do a code review.

MIMIC is a web platform for the artistic exploration of musical machine learning and machine listening. We have designed this collaborative platform as an interactive online coding environment, engineered to bring new technologies in AI and signal processing to artists, composers, musicians and performers all over the world.

Luckysheet is an online spreadsheet like excel that is powerful, simple to configure, and completely open source.

OpenProject is a web-based project management system for location-independent team collaboration.

• Project management and milestones
• Project timelines
• Kanban & Scrum

This is software for collaborative live coding. On one machine, you run an extramuros "server". Then, from as many machines as you like, you use a web browser to connect to the server and code into shared text buffers. Finally, and again from as many machines as you like, your run the extramuros "client" code in order to receive code from the server and pipe it to the language interpreter of your choice (SuperCollider, Tidal, etc). Think of the "client" code as a way for machines to listen in on a public stream of code.

Estuary is a platform for collaboration and learning through live coding. It enables you to create sound, music, and visuals in a web browser. Key features include:

built-in tutorials and reference materials
a growing collection of different interfaces and live coding languages
support for networked ensembles (whether in the same room or distributed around the world)
text localization to an expanding set of natural languages
visual customization via themes (described by CSS)

CryptPad is the Zero Knowledge realtime collaborative editor.

Encryption carried out in your web browser protects the data from the server, the cloud and the NSA. It relies on the ChainPad realtime engine.

Web-based text editing tool that allows to edit documents collaboratively in real-time. It implements a CRDT-based consistency maintenance algorithm for strings for peer-to-peer large scale collaboration. This algorithm called LogootSplit can be seen as an extension for variable-sized elements (e.g. strings) of one of the basic CRDT algorithms for unit elements (e.g. characters). Compared to existing web-based collaborative text editing tool MUTE does not require a powerful central server since the server is not performing any computation. Communication between editor instances is done in a peer-to-peer manner thanks to the Netflux library that is based on WebRTC technology. Our editor offers support for working offline while still being able to reconnect at a later time.

Fragment is a collaborative cross-platform audiovisual live coding environment with pixels based real-time image-synth approach to sound synthesis, the sound synthesis is powered by pixels data produced on the graphics card by live GLSL code, everything is based on pixels!

Zulip is a powerful, open source group chat application that combines the immediacy of real-time chat with the productivity benefits of threaded conversations.

Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.

It is a great solution for communities and companies wanting to privately host their own chat service or for developers looking forward to build and evolve their own chat platforms.

Firepad is an open-source, collaborative code and text editor. It is designed to be embedded inside larger web applications.

Conclave is a peer-to-peer, real-time, collaborative text editor built from scratch in JavaScript. Intrigued by collaborative text editors such as Google Docs, we set out to build our own. This case study walks you through our journey from the initial idea to our research of current academic literature and finally to our design and implementation of the final product.

Teletype for Atom lets developers share their workspace with team members and collaborate on code in real time.

Floobits brings real-time collaborative editing to text editors, IDEs. Collaborative text editors and screen sharing solutions usually suffer from the following problems:

Users are confined to looking at the same thing.
Only one user can edit at a time.
One person is usually stuck in an unfamiliar editor.
Only 2 people can work at a time.

We started building Floobits for ourselves to address these concerns. Floobits allows multiple users to simultaneously edit any file using the text editors they already know.

Riot allows teams to communicate across a wide range of collaboration apps. If some team members use Riot while others use IRC, Slack or Gitter, Riot will allow these team members to seamlessly work together. Riot offers the richest network of communication bridges. Riot lets you run your own server, and provides users and teams with the most advanced crypto ratchet technology available today for a decentralized secure Internet. Riot is entirely open source: all the code is published on GitHub (Apache License) for anyone to see and extend. This means teams can customize or contribute to the code and everyone can benefit from the speed of community innovation. Riot is built on top of Matrix.