Minio - Minio is an open-source minimal cloud storage server.
Datahike - A durable datalog database adaptable for distribution.
Google Cloud Storage - Google Cloud Storage offers developers and IT organizations durable and highly available object storage.
Datomic - The fully transactional, cloud-ready, distributed database
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
Matisse - Matisse is a post-relational SQL database.