A good solution for selection - you modify the node by name only, if the name differs - a new node will be created! Has real-world usage - building graphs is usually a pain, but with such a tool, it becomes easier!

This is a convenient little tool for quickly making graphs and exporting them. There are like 1000 features you could add to this kind of thing, but some I'd like to see would be the ability to add labels to edges and the ability to have directed edges. Nice job.

Nice idea, at beginning i didn't understand how to connect the nodes. 

Maybe you should write that the connection has to be done with more nodes and ;

A cool idea should when you select a node on the left you change the node number and the connections.