Blockly

Open source library for building apps without knowing coding

Screenshots

Hunter's comment

If you want to develop apps but don't know how to code, you may be interested to know about Blockly. It is an open source javascript library for developing apps by which you can just add drag and drop block coding to your project.

The Blockly library adds an editor to your app that represents coding concepts as interlocking blocks. It outputs syntactically correct code in the programming language of your choice. Custom blocks may be created to connect to your own application. Source

Link

https://developers.google.com/blockly