Object Stores edit 
Our list of and information on commercial, open source and cloud based object stores, including Amazon S3, Azure Blob Storage, Google Cloud Storage, OpenStack Swift, Scality, Caringo and alternatives to these. Storage solutions whereby data is stored without any concept of folders or organisational structure, instead being referenced by a unique identifier, allowing for massively parallel and scalable solutions. Generally access via a REST API, with Amazon S3 the defacto standard, although many also support a range of file based interfaces as well, simulating a file system using the underlying object storage. Common features include support for multiple storage tiers, storage of custom metadata against data, replication of data for redundancy, and object versioning. Good explanation of object stores in comparison to file and block stores: http://searchcloudstorage.techtarget.com/feature/How-an-object-store-differs-from-file-and-block-storage Excellent list of object stores including their history: http://www.theregister.co.uk/2016/07/15/the_history_boys_cas_and_object_storage_map/ The three major cloud vendors all have object store services as follows: All other “Enterprise” cloud vendors will also have a comparable offering, generally including Amazon S3 compatibility. Many are based on OpenStack Swift, including IBM Bluemix Object Storage and Rackspace Cloud Files. Other object storage services include: There are also a wide range of other smaller cloud vendors that provide object storage solutions, and many of the object store technologies listed below are also available as a managed service. The following analyst material covers a number of technologies in this category: The following are all Open Source object store technologies: Options for on premise object stores from enterprise vendors, many of which are also available as a service or as a hardware and software appliance, include: The following are other object store products: The following analyst material covers a number of technologies in this category: Many parallel distributed filesystems (such as Gluster) also support object store interfaces, simulating an object store using the underlying filesystem. The following technologies are no longer sold or maintained:Category Definition
Further Information
Object Store Services
Amazon S3 Eventually consistent object store service Azure Blob Storage Strongly consistent object store service, with support for multiple object types (block, page and append) Google Cloud Storage Strongly consistent object store service Wasabi Ultra low cost high performance object storage service - https://wasabi.com/ BackBlaze B2 Claims to have the lowest cost high performance object storage service - https://www.backblaze.com/b2/cloud-storage.html Open Source Object Store Technologies
OpenStack Swift Supports multiple configurable storage tiers and backing storage; part of the OpenStack suite but can be installed stand-alone MinIO Open source Amazon S3 object store with commercial support available - https://www.minio.io/ Zenko CloudServer Open source object storage server based on the S3 compatible API from Scality RING, previously known as Scality S3 Server Ceph Distributed object store that also supports block and file storage, with development led by RedHat - http://ceph.com/ LeoFS https://leo-project.net/leofs/ Redcurrent http://www.redcurrant.io Basho Riak S2 (formally CS) http://basho.com/products/riak-s2/ Joyent (Samsung) Triton Object Storage https://www.joyent.com/triton/object-storage LinkedIn Ambry https://github.com/linkedin/ambry Rook https://rook.io/ Open IO http://openio.io/ Commercial Object Store Technologies
SwiftStack Commercial on premise software solution based on OpenStack Swift with a number of added management features and synchronisation to the cloud, sold by the largest contributor to Swift - https://www.swiftstack.com/ Scality RING Native object store with POSIX filesystem support, and a range of object, file and OpenStack compatible APIs Caringo Swarm (formally CAStore) Software and appliance solution - https://www.caringo.com/ Cloudian HyperStore Software and appliance solution - https://cloudian.com/products/ Dell EMC Elastic Cloud Storage (ECS) https://www.emc.com/en-us/storage/ecs/ DDN WOS http://www.ddn.com/products/object-storage-web-object-scaler-wos/ Exabloc https://www.exablox.com/ RedHat Ceph https://www.redhat.com/en/technologies/storage/ceph HGST (Western Digial) ActiveScale https://www.hgst.com/products/systems Hitachi (HDS) Content Platform (HCP) https://www.hds.com/en-us/products-solutions/storage/content-platform.html IBM Cloud Object Storage (previously Cleversafe) https://www.ibm.com/cloud-computing/products/storage/object-storage/cloud/ NetApp StorageGRID Webscale http://www.netapp.com/us/products/data-management-software/object-storage-grid-sds.aspx Quantum Lattus Object Storage http://www.quantum.com/products/bigdatamanagement/lattus/index.aspx NooBaa https://www.noobaa.com Object Store Caches
Rubix Open Source object store cache for Hadoop compatible tools from Qubole - https://www.qubole.com/rubix/ Parallel Distributed Filesystems
Historical Technologies
CoreOS Torus Development stopped Feb 2017 - https://github.com/coreos/torus Skylable Website no longer live - http://www.skylable.com Blog Posts