Overview of Lifecycle Sites

Is there an overview or reference document that describes the external sites available through a Lifecycle subscription? I know we can enable a site and not subscribe any computers to see the content, but it would be nice to have a reference for what each site does/is used for.

Perhaps this? BigFix 11 Lifecycle

Related to the general puzzle of "What's included in what?", @itsmpro92 did amazing work on product bundles vs site content a while back.