Where developers dwell

Although this Discourse forum has become the most active community for Users, it isn’t as well visited by Developers.

The Gramps-Devel Mailing List has a different audience.

And the GitHub Gramps-Project repository may have different followers.

The Finnish developers probably have a back-channel for the Isotammi project.

The French Gramps discussion on the Geneanet forum has its own set of developers.

Some Developers group eMail a small set of proven to be more-responsive beta testers when then want to test less publicly.

The Gramps-Web is beginning to diverge with new display and report features not available for the DT. It isn’t just playing feature catchup anymore.

What other places/channels do Gramps developers and contributors use for discussion and mutual aid?