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Coccinella is a free and open-source cross-platform communication tool with a built-in whiteboard for improved collaboration with other people.136 weekly downloads
ChemVisio is software which might be useful for educational purposes (non-organic chemistry, crystallography etc.). It might be a good visualization support for all people who need better illustrations than that you could see in books.
A combination of useful tools for High School classes, including math classes ranging from prealgebra to calculus, and science classes ranging from IPS to AP Physics.