Hibernate has CR postfix in their releases for the 4.0 version of hibernate, for example 4.0.0.CR7. What does the CR part mean? When would I use this kind of release numbering?
It's actually Candidate Release.
CR=candidate for release
The use of the CR (Candidate Release) qualifier is for releases that we anticipate can be the GA release, but we need the community to help validate the release. Again, there is an optional numeric qualifier that can be added if there is a need for multiple CR releases. Finally, the use of the Final qualifier is for completed releases for the community.
Check the following links for more information and confirmation: