@Bmueller and @TBurmeister have been thinking about controlled vocabularies for various tagging attributes that are being considered to help the community organize and find toolinfo records. They are interested in knowing a bit more about the values that have been placed in the freeform "keywords" field of the existing records cataloged by Toolhub as part of their research.
One way to get this data would be to ask Elasticsearch for it which might look something like:
$ curl -XPOST -H "Content-Type: application/json" 'localhost:9200/toolhub_tools/_search?pretty' --data '{"size":0,"aggs":{"keywords":{"terms":{"field":"keywords.keyword","size":10000}}}}' | jq -r '.aggregations.keywords.buckets[] | [.doc_count, .key] | @tsv'