SaaS - Software as a Service

These SaaS tools can be used to build, manage and deliver SaaS services over a variety of different cloud platforms (PaaS). Some of these platforms are available for installation on a private cloud while others run only on a third-party host.

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Amazon EC2
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Appirio
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Eucalyptus Ubuntu Enterprise Cloud
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Force.com
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Google App Engine
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IBM LotusLive
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iCloud
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Intuit Partner Platform
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Joyent Cloud Control
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LongJump
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Microsoft Windows AppFabric