Blockly is a library created in 2011.

Blockly is a client-side JavaScript library for creating visual block programming languages and editors. It is a project of Google and is open-source under the Apache 2.0 License. It typically runs in a web browser, and visually resembles Scratch. Read more on Wikipedia...

• Blockly Wikipedia page
• Blockly first developed in Google and Massachusetts Institute of Technology
• See also: (9 related languages)JavaScript, Scratch, Python, PHP, Dart, WebGL, SVG, Android, iOS