Difference between Jboss Fuse 6.x and Jboss Fuse ESB 4

Hi All,

Could anyone explain a difference between these 3 products?
- Jboss Fuse - https://access.redhat.com/documentation/en/red-hat-jboss-fuse/
- Jboss Fuse ESB - https://access.redhat.com/documentation/en/fuse-esb/
- Jboss Fuse ESB Enterprise - https://access.redhat.com/documentation/en/fuse-esb-enterprise/

Regards,
Timofey