In 2017, the name was formally changed to OCLC, Inc.[3] OCLC and its member libraries cooperatively produce and maintain WorldCat, the largest online public access catalog (OPAC) in the world.[5] OCLC is funded mainly by the fees that libraries have to pay for its services (around $200 million annually as of 2016[update]).[1] OCLC also maintains the Dewey Decimal Classification system.