The features are fas tcreation of base meshes in sculpt mode and drawing them as a shape onto a mesh. You also have the mirror and symmetrize options in sculpt mode now and when remeshing the base mesh with JSculpt Tools the mirror modifiers are applied automatically.

The free addons can be downloaded here:

JMesh Tools:
https://github.com/jayanam/jmesh-tools

JSculpt Tools:
https://github.com/jayanam/jsculpt-tools

I recommend to use both addons in combination.

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