Bitcoin blockchain explorer, it merges addresses together, if they are part of the same wallet, sometimes can identify wallet name (name of exchange, mixer and other BTC services). All informations are from WALLETEXPLORER.COM.
Functionality of WALLETEXPLORER: Just basic algorithm is used to determine wallet addresses. Addresses are merged together, if they are co-spent in one transaction. So if addresses A and B are co-spent in transaction T1, and addresses B and C are co-spent in transaction T2, all addresses A, B and C will be part of one wallet. Sometimes, address belongs to some service but it was never co-spent with other. Then that address stays unnamed. It is typically more often at addresses with higher amount (as there is no need to co-spending).