Simple Chain Physics

Requires Blender 4.3+

2 Geometry nodes that allow for simple chain/rope physics in Blender.
1 connects two specified points on any mesh using either their origin, or vertices specified by a vertex group.
The other turns curves into physics sim chains/ropes.

Both node groups allow for framed step simulation, or an instant speed simulation that calculates the entire process at once.

The attached file also contains a text file describing how to use the node groups in more detail.