babylon

Virtual whiteboard for sketching hand-drawn like diagrams

Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies

The communications platform that puts data protection first.

whiteboard SDK / infinite canvas SDK

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.

Desktop/Android/HTML5/iOS Java game development framework

Zulip server and web application. Open-source team chat that helps teams stay productive and focused.

Shared data types for building collaborative software

Etherpad: A modern really-real-time collaborative document editor.