All Eclipse downloads are provided under the terms and conditions of the Eclipse Foundation Software User Agreement unless otherwise specified.
For evaluation and testing purposes the first full release of Hudson from the Eclipse Foundation is now available. This WAR file is suitable for any O/S.
For more information about installing and running Hudson start here
Hudson 2.2.0 is the current production release of the CI server. This release is available outside of Eclipse under the MIT license. Head on over to hudson-ci.org for more information.
Releases of Hudson prior to 2.2.0 are available for download from java.net. These versions are all non-Eclipse and are available under the MIT license.