StorAmp - StorAMP is a FREE cloud storage explorer that supports variety of cloud providers:
VMware vSAN - VMware vSAN is radically simple, enterprise-class software-defined storage powering VMware hyper-converged infrastructure.
Cloud Storage Manager - Cloud Storage Manager provides you with an Explorer view of all your Azure Blobs. You can see details of each individual Blob, including Blob size, date the Blob was created and modified, as well as what Storage Tiering the Blob currently is in.
AWS Storage Gateway - AWS Storage Gateway is a service connecting an on-premises software appliance with cloud-based storage.
CloudXplorer - This cloud storage management system enables the clouds users to manage and explores their favorite cloud storage accounts in a more systemized way.
Minio - Minio is an open-source minimal cloud storage server.