Open Source Interactive Whiteboards

Excalidraw is an open-source whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them. Available directly online as a web app and also through CodeSandbox to easily see how the code works, and the app is available for self-hosting.

OpenBoard is a cross-platform (Linux / Windows / macOS) interactive whiteboard application. It is currently maintained by the Education Department (DIP) of the Canton of Geneva in Switzerland.

Apache OpenMeeting is a free and open-source software for group communication and collaboration. It provides virtual "meeting rooms" for users to collaborate through video conferencing and messaging and features a white board for collaborative drawing as well as...

scrumblr - Collaborative Online Scrum (whiteboard + kanban) Tool Using Websockets, Node.js, jQuery, and CSS3

Spacedeck lets you easily combine all kinds of media on virtual whiteboards: Text notes, photos, web links, even videos and audio recordings.

Explain Everything is an easy-to-use design, screencasting, and interactive whiteboard tool that lets you annotate, animate, narrate, import, and export almost anything to and from almost anywhere.

The Sankoré software is an interactive white board software. Certainly one of the most exciting projects related to open education. It offers the opportunity to teach differently while using current teaching tools.