Circle Slicer is a circular slicing tool for After Effects, made by ALINCO. It works from compositions set to a 1:1 aspect ratio: create a square composition, place the content you want to slice inside it, then click the button of your choice to produce the result.
One of those options is Make by shape, which comes with a controller. The plugin is listed here as free, and a demo video is available on YouTube.
Circle Slicer is at version 1.6, released February 24, 2025, and supports After Effects 2024, 2023 and 2022. Its history runs from an initial release in 2022 through updates that tracked newer After Effects versions, with the latest build listed as a bug fix. It's part of the aescripts library.