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Gartner foresees continuing growth in all sectors (and particularly IaaS, PaaS and SaaS), reflecting the seemingly relentless march of public cloud adoption. But although 'everything' is increasingly available as a service, there's a long way to go. "As of 2016, approximately 17 percent of the total market revenue for infrastructure, middleware, application and business process services had shifted to cloud. Through 2021, this will increase to approximately 28 percent," said Gartner's Nag.

Key providers 
AWS, Cisco, Google, Juniper, Microsoft, Nuage Networks, VMware
Storage as a service 
AWS, Google, IBM (Bluemix), Microsoft, Oracle, Tencent, Rackspace, Virtustream
IT infrastructure
Infrastructure as a service (IaaS)
AWS, CenturyLink, Fujitsu, Google, IBM, Interoute, Joyent, Microsoft, NTT Communications, Oracle, Rackspace, Skytap, Virtustream
App development
Platform as a service (PaaS)
Appian, Betty Blocks, Caspio, Fujitsu, kintone, Mendix, Oracle, OutSystems, QuickBase, Salesforce, ServiceNow, TrackVia, Zoho
Software as a service (SaaS)
Adobe, ADP, AWS, Atlassian, Box, Cisco, Akamai, DocuSign, Dropbox, Google, Microsoft, MuleSoft, Oracle, Salesforce, ServiceNow, Slack, Workday, Zendesk
Containers as a service (CaaS)
AWS, Google, IBM, Joyent, Rackspace
Function as a service (FaaS), or 'serverless'
AWS, Google, IBM, Microsoft
Desktop PCs
Desktop as a service (DaaS), or PC as a service (PCaaS)
Adapt, AWS, Citrix, Dell Services, dinCloud, Dizzion, Evolve IP, NaviSite, NuveStack, The Sixth Flag, VMware
Security as a service (SECaaS)
AT&T, Atos, BAE Systems, BT, CenturyLink, CSC, HCL Technologies, HPE, IBM, NTT Security, Orange Business Services, SecureWorks, Symantec, Trustwave, Verizon
Database platform as a service (dbPaaS)
Aiiria, Altiscale, AWS, BlobCity, Cazena, CenturyLink, Citus, ClearDB, Clusterpoint, CumuLogic, Database Labs, EnterpriseDB, Google, IBM, Instaclustr, Microsoft, Mirantis, mLab, MongoDB, Oracle, Qubole, Rackspace, Redis Labs, Salesforce, SAP, Snowflake, Teradata, Tesora, Tieto

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