Nice particle-based physics engine
Geeks3d has an article on Lagoa physics engine, which seems quite impressive.
Direct quote from site:
Lagoa Multiphysics is a new physics engine created by Thiago Costa. This physics engine is focused on particles.
I have been thinking about this kind of idea to approximate continuous matter as a set of constrained point-bodies (particles) and here mr. Costa brilliantly shows how impressive things you can create with this kind of system. Hopefully later on he will add more rigid bodies as well and destruction thingies.
Also this kind of solver should be just great for GPU-acceleration for physics!