Stop-Mo is a free Blender add-on from SouthernShotty LLC that applies a stop motion style to 3D animations. A one-click conversion turns an existing animation into stop motion, and customizable settings let you adjust the frame rate and range to fine-tune the result.
Beyond the core conversion, Stop-Mo includes a real-time preview so you can watch the stop motion result as you work. It can also rotate and animate textures with a single click, and the effect is easily removable through a select and remove option if you want to revert.
The add-on is released under a GPL license and listed here as free, with a donation option for anyone who wants to support the author. SouthernShotty built it for a personal short film and notes that support isn't provided, though documentation and a tutorial video are available. It targets Blender versions 3.4 through 5.1.