Google's Freebase recently announced the Knowledge Graph Search API, which will enable developers to query the Knowledge Graph for entities.
The API uses standard schema.org types and is compliant with JSON-LD specifications. Freebase says it's working on a replacement for the Freebase Suggest Widget that leverages the Knowledge Graph Search API. They hope to release that early next year.
"In December of last year, we announced that we would wind down the Freebase service and transfer the data to Wikidata," Freebase says in a Google+ update (via Search Engine Land). "We also made a commitment to continue to support users of the Freebase API by creating a replacement API that would help with searching the Knowledge Graph."
"We will continue to support the Freebase API and widget for three full months after the Suggest Widget replacement is released, at which point we will shut it down," they say.
You can stay up to date on developments via the Google Developers channel.
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