What is this kind of widget called? Connector? Wire?
*Click on one point on a widget and drag it to another point on another widget, and a connection (wire, cable, line) is made between the two.*

I'm looking for a (open source) web toolkit that has this type of widget, but I don't even know what it is called. So it's a bit difficult to find. Examples would be nice.
What is this kind of widget called? Connector? Wire?
===

*Click on one point on a widget and drag it to another point on another widget, and a connection (wire, cable, line) is made between the two.*

I'm looking for a (open source) web toolkit that has this type of widget, but I don't even know what it is called. So it's a bit difficult to find. Examples would be nice.