This GitHub repository stores manifests of some public Wikibase instances.
By entering a manifest in OpenRefine's Wikibase selection dialog window (Select Wikibase instance...
in the Wikidata/Wikibase extension menu), you can start (batch) editing that particular Wikibase.
Click the Add Wikibase
button to add the manifest's URL (preferred) or json.
See OpenRefine's documentation for some additional information.
Manifests following the version 2 syntax, such as the Wikimedia Commons manifest, only are supported in OpenRefine 3.6 onwards, not in older versions of OpenRefine.
You can write manifests for other Wikibase instances according to this tutorial and make them discoverable by sending a PR here. Also feel free to add them to the table above 😎