Wiggler for Premiere Pro and After Effects allows animation of Opacity, Translation, Rotation, Scale and Shear using a wiggle-like function.
Fog Effect allows the user to create a layer of fog, diffusion and mist instantly, without the use of depth maps.
This tutorial describes how a C++ .aex plugin can be packaged into a .zxp file.
If you have a plugin that is just a .aex file, it must be installed manually. To do this, simply copy the .aex file into the After Effects Plug-ins folder.