PixelShox and hence QuartzComposer is one
BlendeR is getting some now,
for an example usage, http://mke3.net/rt/ncm020.vfxtalk.jpg is a scene from the movie Matrix 2, and http://mke3.net/rt/ncm020.script.jpg is the corresponding node layout in ShakE?, which is a CompositoR? so those nodes are about layers and passes - effects, mattes, masking, blurring
