Timeline is mainly hosted by SourceForge.
Project URL: http://sourceforge.net/projects/thetimelineproj
We use Mercurial and the repository is hosted at SourceForge.
We use a mailing list provided by SourceForge. We use only a single list, and we use it for all kinds of communication.
We host our own Jenkins server to automatically test Timeline on different platforms whenever the source code changes.
If a build fails, an email will be sent to the mailing list.