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Pixabay.com is a free stock photography and royalty-free stock media website. It is used for sharing photos, illustrations, vector graphics , film footage , stock music and sound effects , exclusively under the custom Pixabay Content License, which generally allows the free use of the material with some restrictions.
reconstructed and released by OPenn as Free Cultural Works: CC BY [8] [9] [10] Free Culture: 2004: by Lawrence Lessig (the first CC licensed book released by a major mainstream publisher, Penguin Books) CC BY-NC 1.0 [11] Freesouls: 2008: 2010 (digital ebook) book with essays and photos of key people of the free movement by Joi Ito: CC BY [12 ...
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Everystockphoto.com – Searching over 4.3 million public domain and creative commons photos including Wikipedia and NASA. Free user accounts with drag and drop collections, and other features. Google Image Search – Advanced search can search for free licensed or PD works. By default, Google does not filter based on license.
Date/Time Thumbnail Dimensions User Comment; current: 21:20, 23 September 2019: 1,105 × 440 (22 KB): Handroid7: All three linear gradient points (or “stops”) of the light reflection in the upper right corner of the “Tube” are now white (hexadecimal: “ffffff”) with a shade of transparency (alpha channel).
The Geometer's Sketchpad is a commercial interactive geometry software program for exploring Euclidean geometry, algebra, calculus, and other areas of mathematics.It was created as part of the NSF-funded Visual Geometry Project led by Eugene Klotz and Doris Schattschneider from 1986 to 1991 at Swarthmore College. [1]
GeoGebra is software that combines geometry, algebra and calculus for mathematics education in schools and universities. It is available free of charge for non-commercial users. [6] License: open source under GPL license (free of charge) Languages: 55; Geometry: points, lines, all conic sections, vectors, parametric curves, locus lines