Download UI Node Connect Free Unity. 

UI Connect is an easily customizable UI framework to turn UI Objects into connectable drag/drop blocks.

Customizable UI framework with Wirable drag/drop blocks and a custom UI line renderer to create interactive interfaces as flowcharts, circuit boards, connection puzzles, node graph and others.

Add your own sprites, texts, colors, buttons and turn any UI Object (with an Image component) into a Connectable Block.