MCG:Tubo shape object.
This MCG shape allows you generate smoothly connected spline between two objects with sagging option. You can animate start/end object. Tubo will dynamically connect two objects while trying to keep the overall length of spline.
http://bit.ly/MCGTuboVimeohttp://bit.ly/MCGTuboAs always, it is free to download and use.
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I haven't been able to get it to run on Max 2016 but it does look like a good addition.