As the cloud matures, many businesses are finding that not every application belongs in public clouds. Due to regulatory issues, security risks, data ownership concerns, and fears of cloud lock-in, many applications are stubbornly rooted in on-premises architectures.

The startups in this roundup understand that, and rather than trying to sweet talk enterprises into forklift upgrades, these startups are willing to work under hybrid-cloud constraints.

[ Now see After virtualization and cloud, what's left on premises?]

The startups below federate data, making it available from any cloud to any application; provide application virtualization software, which enables enterprises to move workloads to and from various clouds at will; provide cloud file systems that optimize and mobilize data, and much more.

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