Presentation at Unite earlier this year showcased a kind of rope made out of rigidbodies with some constraints applied to them. How should we go about implementing such entities with the Physics package? Are these constraints already released? Speaking of, are other, more specialized physics features such as joints, springs and wheels out?
You may find what you are looking for on this page:
https://github.com/Unity-Technologies/EntityComponentSystemSamples
There are physic examples and ECS examples. The physic examples have a scene with all kinds of joints.