We just launched "CoCalc Slides"! To try them, click +New --> Slides.
You can create any number of slides, and use all the same tools as
from the whiteboard: text, notes, freehand drawing, Jupyter code
cells, mind maps, icons, and frames. Of course, text is markdown or
rich editable with full latex formula and code block support.
https://github.com/sagemathinc/cocalc/discussions/6420
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Best Regards,
William Stein
CEO, SageMath, Inc.
https://cocalc.com