To download the latest Pipeline version 20111215 with its cross-platform GUI:
See the release notes for more information.
You can also visit the Pipeline GUI SourceForge Downloads to get older versions.
Pipeline command-line tool
To download the Pipeline Core packages (use this version if you are running the Pipeline via the shell/commandline, or as an embedded service):
You can also visit the Pipeline Core SourceForge Downloads to get the sources and older versions.