AUTO RIG PRO
for an Unreal Engine 5 Humanoid bone system, using the CoolCat Rig as an example. Super Important to look at the TOP LEFT of the image, the number of deformation bones is super optimized making the rig extremely light, without losing the animation data in the process.
AUTO RIG PRO
for a Unity Humanoid bone system. There are some changes between the two rigs but generally speaking, both are a bit similar except for the bone naming.
SK_UnityEngine_BoneHierarch
SK_UnrealEngine_BoneHierarchy