Contrail was a Cloud Federation computing project that ran from 2010-10-01 until 2014-01-31. This website - http://contrail-project.eu/ - summarizes the results and activities of the project. Please remember that the longer the project has passed, the less relevant the information will be. Most of the software is further developed in other projects. In most cases, the software components web sites are a good starting point for further investigation.