Forums
Eclipse Community Forums for Titan
You can find discussions about different kind of problems and requests, as well as announcements and useful guides. You can also open a new topic if you need help from the community.
GitLab issues
If you have a specific request or you would like to report a bug, please open an issue in GitLab for the respective subproject.
Developer Mailing List
Mailing list of the developers. This is the least preferred way of communication, please use the other options if possible.