>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 by Nicholas Jackiw for the Visual Geometry Project at Swarthmore College. It is designed to run on Windows 95 or Windows NT 4.0 or later and Mac OS 8.6 or later (including Mac OS X). It also runs on Linux under Wine with a few bugs.
>The origins of The Geometer's Sketchpad date back to the 1980s and to the Visual Geometry Project, a research project at Swarthmore College under the direction of Drs. Eugene Klotz and Doris Schattschneider. This project, funded by the National Science Foundation, aimed to develop new technology-based materials for use in the teaching of geometry. Under its umbrella, Nicholas Jackiw pioneered the development of the first version of The Geometer's Sketchpad. The program's name honors Ivan Sutherland's 1963 SKETCHPAD program, a groundbreaking early work in interactive computer graphics (Sutherland, 1963).
This remains my favorite software ever written. It's so simple but you can do so much with it. You can end up "rediscovering" bezier curves, ellipses, and parabolas as loci of various forms. It's really something else. Well worth a couple bucks a year for my license.
https://en.wikipedia.org/wiki/The_Geometer%27s_Sketchpad
>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 by Nicholas Jackiw for the Visual Geometry Project at Swarthmore College. It is designed to run on Windows 95 or Windows NT 4.0 or later and Mac OS 8.6 or later (including Mac OS X). It also runs on Linux under Wine with a few bugs.
http://www.dynamicgeometry.com/General_Resources/The_Sketchp...
>The Sketchpad Story
>The origins of The Geometer's Sketchpad date back to the 1980s and to the Visual Geometry Project, a research project at Swarthmore College under the direction of Drs. Eugene Klotz and Doris Schattschneider. This project, funded by the National Science Foundation, aimed to develop new technology-based materials for use in the teaching of geometry. Under its umbrella, Nicholas Jackiw pioneered the development of the first version of The Geometer's Sketchpad. The program's name honors Ivan Sutherland's 1963 SKETCHPAD program, a groundbreaking early work in interactive computer graphics (Sutherland, 1963).
Geometer's Sketchpad Tutorial: https://www.youtube.com/watch?v=EP-AkvJtMWU
Short Video Showing What's New in The Geometer's Sketchpad® 5: https://www.youtube.com/watch?v=JT70rqQ0I-8
Geometer's Sketchpad: Demonstration: https://www.youtube.com/watch?v=FqjWBeR_nqQ