very good whiteboard infinite canvas SDK
Etherpad: A modern really-real-time collaborative document editor.
⚡️⚡️⚡️ Self-hosted collaborative bookmark manager to collect, read, annotate, and fully preserve what matters, all in one place.
Library for building distributed, real-time collaborative web applications
best way to save what you love
Open-source office suite pack that comprises all the tools you need to work with documents, spreadsheets, presentations, PDFs, and PDF forms on Windows, Linux, and macOS
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
Focalboard is an open source, self-hosted alternative to Trello, Notion, and Asana.
json-joy is a library that implements cutting-edge real-time and collaborative editing algorithms and utilities for JSON data models, with a focus on developing the JSON CRDT (Conflict-free Replicated Data Type) specification and implementation.
The Secure CommsOS™ for mission-critical operations
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
tine groupware main repository
Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots
Markdown note-taking web application designed for simplicity
