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"GeoGebra Free mathematics software for learning and teaching Download spreadsheet-view-cobweb.png Interactive graphics, algebra and spreadsheet From elementary school to university level Free learning materials"

"Greenshot is a light-weight screenshot software tool for Windows with the following key features: Create complete or partial screenshots quickly. Easily annotate, highlight or obfuscate parts of the screenshot. Send the screenshot to a file, the clipboard, a printer or as e-mail attachment."