I work on OpenRefine. Part of this work is carried out as a volunteer, the rest is funded by various grants. If you want to get started with OpenRefine for Wikidata, check out the tutorial series. You can also use it edit structured data on Wikimedia Commons and upload new Commons files.
I am looking for developers interested in taking over the development and maintenance of OpenRefine's Wikibase integration, as I am currently working on OpenRefine's architecture. Feel free to contact me about that!