ALINCO

Circle Slicer is a circular slicing tool for After Effects. Work inside a 1:1 composition, add the content you want to slice, then click a button to run it, with an optional controller under the Make by shape mode.

MaskShapeConverter is an After Effects script from ALINCO that converts masks to shapes and shapes to masks. It supports keyframes, a Merge Shapes setting, and options for track mattes and 3D layers.