Blockly

A project of Google, it is free and open-source software released under the Apache License 2.0.

[2] It typically runs in a web browser, and visually resembles the language Scratch.

[4] Neil Fraser began the project with Quynh Neutron, Ellen Spertus, and Mark Friedman as contributors.

The workspace also includes, by default, zoom icons, and a trashcan to delete blocks.

[5] The editor can be modified easily to customize and limit the available editing features and blocks.