notebookcast.com
NotebookCast is a free online collaborative whiteboard that does not require signup to start using. It supports real-time multi-user drawing, includes built-in time-unlimited audio and video calls, and provides tools such as shape drawing, sticky notes, text editing, and screen sharing. Users can create reusable whiteboard templates, access night mode, and share whiteboards via links. A free registered account allows saving whiteboards to a personal dashboard, and the tool works on any modern browser.
