The Symfony CMF project makes it easier for developers to add CMS functionality to applications built with the Symfony PHP framework.
Most of the Symfony CMF bundles provide some functionality, they integrate a library or they introduce a complete new concept.
Other bundles provide an example on how to use these key bundles. They all show a different way of implementing a concept. You can use these bundles in your project, but you can also get ideas from these bundles to create your own bundle based on the key bundles.
Besides that, the Symfony CMF team also maintains some 3th party bundles which help with integrating PHPCR concepts into the Symfony Framework.
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