DX9 Particle Systems
Related nodes
Native:
Particles (Spreads)
Addonpack:
Particles (2d Field)
Particles (2d ForceField)
Particles (3d Field)
Besides the nodes from the Addonpack contributed by vux (see left column) there are two powerful particle system contributions:
There is also this very comprehensive guide written by dottore about DX9 GPU particles.
This forum thread is an interesting read about CPU-based particles. And vvvv's c#-utility library comes with a simple Particle Class which should be a good start for simple CPU particles.
And don't forget the related contributions by other users: