Complete rewrite and revival of iconic Keymesh add-on by Pablo Dobarro, one of the creators of modern sculpt mode. Add-on also includes updates from Aldrin Mathew. Original testing and images/videos by Daniel Martinez Lara
With Keymesh, you can create stop-motion-like animations inside Blender in a very traditional way. Keymesh makes it possible to swap object data between frames for almost every type of objects. That means you can sculpt, model, groom, or paint frame-by-frame to craft beautiful (additive, destructive) animations!

This version of Keymesh has been updated to work on all types of objects, so that you can animate flowing hair curves, floating volumes, or just text changing between frames in stop-motion style. This implementation also intends to make Keymesh usable in production environment, both for 3D and actual stop-motion studios.

Features of the add-on include:

Frame Picker
Keymesh Too has a new Frame Picker UI that lists all versions of objects you’ve made with Keymesh, lets you organize them and insert new keyframes easily, without having to duplicate keyframes in Dope Sheet. Updated UI also displays a number of times each version of the object is used in the animation.

(Keymesh can also work as an object versioning add-on, so it is useful for modelers and sculptors too. Internally it works by saving multiple versions of the object data (e.g. Mesh, Curve), meaning you can save, for example, different layers of your sculpting, and different variants of the model you can’t decide between. And you can put them on the timeline, scrub, and see all versions of your object!)

etc

Other Changes:
Updated to Blender 5.0.
Frame Picker UI list is now library-overridable.
Removing the last Keymesh block from the list will restore the object to the “normal” state, instead of deleting it.
Default sidebar category changed from “Animate” to “Animation”.
Versioning for old versions of the add-on (before the extensions platform) has been dropped.
Preferences for default scene properties have been removed.
5 bug fixes.