Forester is a script that allows you to easily generate a large amount of object on a surface. It's very useful to create forests, rocks, garbages, etc...
OceanSplash is a plug-in for Maya(3D Application). This plug-in creates awesome splashes for your animated objects with in seconds, which otherwise would require even for an expert to spend days in order to create one
Pixie dust is sprits based automated fantasy(magicle) dust creation script with twinkle effects. which use a sequence of optical FX images to generate dust effects.
Soft Cluster EX is a python and c++ based tool for converting soft selection to cluster or joint, supports common types of deformable geometry(e.g. polygon,nurbs ,subdiv and lattice) with a lot of advance features.