BoxCryptor - Boxcryptor encrypts your sensitive files before uploading them to cloud storage services like Dropbox, Google Drive, Microsoft OneDrive, Box, and many others.
Minio - Minio is an open-source minimal cloud storage server.
Cloudfogger - Easy and secure encryption for the cloud. Provides security for all cloud storage services like Dropbox, OneDrive and Google Drive.
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
Mega - Secure File Storage and collaboration
IBM Cloud Object Storage - IBM Cloud Object Storage is a platform that offers cost-effective and scalable cloud storage for unstructured data.