BigTable is a compressed, high performance, and proprietary database system built on Google File System (GFS), Chubby Lock Service, and a few other Google programs; it is currently not distributed or used outside of Google, although Google offers access to it as part of their Google App Engine.

Reference: https://labs.google.com/papers/bigtable.html

Amazon SimpleDB is a distributed database written in Erlang[1] by Amazon.com. It is used as a web service in concert with Amazon Elastic Compute Cloud (EC2) and Amazon S3 and is part of Amazon Web Services.

Reference: https://aws.amazon.com/simpledb/

Amazon Simple Queue Service (Amazon SQS) is a distributed queue messaging service introduced by Amazon.com in April of 2006. It supports programmatic sending of messages via web service applications as a way to communicate over the internet.

Reference: https://aws.amazon.com/sqs/

Cloud files is a cloud storage service that provides "unlimited online storage and CDN" for media (examples given include backups, video files, user content) on a utility computing basis (at USD 0.15/GB/month)

Reference: https://www.rackspacecloud.com/cloud_hosting_products/files

Amazon S3 (Simple Storage Service) is an online storage web service offered by Amazon Web Services. Amazon S3 provides unlimited storage through a simple web services interface.

Reference: https://aws.amazon.com/s3/