Algodoo

A low collision chain I made that has at most three collisions per contact area.
Most physical chains use cut out circular areas for the contact space, so there's usually about 50 collisions per contact space. These chain links use a triangular space to cut down on collisions.

Can hold about 50 kilograms without stretching, but the chain link parts have default values, except for friction. Usually you have to make the chain more dense for it to hold any kind of weight.