Awesome

a Quark for SuperCollider

install it from within supercollider with the command Quarks.install("TraerPhysics") and then recompile.

TraerPhysics

A simple particle system physics engine.

after Jeffrey Traer Bernstein - https://web.archive.org/web/20170620031206/http://murderandcreate.com/physics/

see the helpfile TraerPhysicsOverview for classes and link to examples.