Blender Studio Rigging Tools
CloudRig: Rig Types
CloudRig adds its own rig types to Rigify, each of which are identified by their name, which starts with "cloud_". Once you add a CloudRig rig type to your armature, it is considered a CloudRig metarig, which will unlock all the additional features that come with the feature set.
You can find a written documentation of all rig types on the wiki.
