Azure Blob Storage - Use Azure Blob Storage to store all kinds of files. Azure hot, cool, and archive storage is reliable cloud object storage for unstructured data
Dropbox - Online Sync and File Sharing
DigitalOcean Spaces - The simplest way to cost effectively store, serve, backup, and archive a virtually infinite amount of media, content, images, and static files for your apps.
Google Drive - Access and sync your files anywhere
Minio - Minio is an open-source minimal cloud storage server.
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.