You can use the Apache Archives to download all the Camel releases.
- http://archive.apache.org/dist/camel/apache-camel/ - All release since Camel became a top level Apache project
- http://archive.apache.org/dist/activemq/apache-camel/ - For old 1.x releases when the Camel project was a sub-project of Apache ActiveMQ
The links below contains the release notes for all the Camel release. However if you want to download the release, you must use the download archives, which is the two links above.
All time Apache Camel releases notes: