For 3D models with animate topology (dynamic meshes used in animation), the best auto-rig tools are Mixamo, Blender’s Auto-Rigger Pro, and Character Creator 4—they simplify rigging while supporting topology-friendly deformations.
Mixamo integrates with Maya/Blender/Unreal and has pre-made animations for quick testing. Auto-Rigger Pro is free for Blender users and adapts to custom topology. Character Creator 4 links to Daz3D assets and offers export-ready rigs for games/films.
If you’re new to auto-rigging animate topology, start with Blender’s built-in Rigify or Mixamo’s free library to practice how rigs interact with mesh changes before trying paid tools.