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Sling powers Day's entire CQ5 family of content management products (Web Content Management, Social Collaboration, Digital Asset Management), and is included in Day's CRX content repository, which is itself based on Jackrabbit.
Public websites Quite a few high profile mission critical websites are powered by CQ5 include:
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(or by previous CQ versions) - Day's
customer list mentions a few.
CQ5 has been very well received by the press and by analysts, and Sling has played a major part in this success, by enabling the CQ5 development team to create robust and higly modularized software very efficiently.
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