Launchpad is a website that offers free project hosting, issues tracking and translations for free or open source applications. For commercial applications they have available a paid subscription. Can be a better alternative to Sourceforge because you can add commercial projects with a paid upgrade.
Users can create projects, teams with members for each project, track one bug across different (or all) projects of for a specific one. It offers tools that helps to translate your project in different languages.
Using a platform like this may have other benefits such as developing new relations and exchange experience with other developers.
Each project can have a mailing list and all team members can be notified easily about new problems or tasks.