An open listing (or non-exclusive listing) lets an owner sell their home by themselves, but guarantees a Real Estate Broker if they bring you a buyer, they will receive a commission.
An Open Listing is a non-exclusive agreement, so the owner may execute open listings with more than one real estate broker and pay only the broker who brings an able buyer whose offer the owner accepts. The Seller will not receive representation on their side of the transaction, so the seller will not be covered under the listing brokers Insurance, nor does the Broker have a fiduciary duty to the Seller.
Note: Open listings are not popular with many full-service real estate brokers.