Google released a visual programming language Google Blockly, similar to the children programming language Scratch developed by MIT. You can build an application using some graphic objects, this is like playing LEGO toys. Eveny graphic object is a code block,  you can integrate them together to create simple functions, then you can combine some simple functions together to build a complete application. Users can drag blocks together to build an application. No typing required.This project looks like App Inventor given up by Google, we don't know whether there are relationships among Blockly, App Inventor  and Scratch.

You can download Blockly here.

Reference : http://developers.solidot.org/article.pl?sid=12/06/04/1110203