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About Scratch
Scratch is a free visual programming language. With Scratch you can easily create animations, games, etc. and provide a stepping stone to the more advanced world of computer programming. It can also be used for a range of educational and entertainment constructionist purposes frommath and science projects, including simulations and visualizations of experiments, recording lectures with animated presentations, to social sciences animated stories, and interactive art and music.Viewing the existing projects available on the Scratch website, or modifying and testing any modification without saving it requires no online registration.
Scratch allows users to use event-driven programming with multiple active objects called sprites. Sprites can be drawn, as vector or bitmap graphics, from scratch in a simple editor that is part of Scratch, or can be imported from external sources, including webcams.
As of 2013, Scratch 2 is available online and as an application for Windows, OS X, and Linux (Adobe Air Required).
The informations are taken from: https://en.wikipedia.org/wiki/Scratch_(programming_language)