We have this Slack chat service for Gretl and related subjects (also non-related ;) )

It is another channel that anyone can use for rapid exchange of files and discussions, and even face-to-face calls, or meetings.

This is the invite link: https://join.slack.com/t/gretl-econometrics/shared_invite/zt-waoqek6r-M2A_lvVbhdYdUV2O8ZyL1w

This is the URL: https://gretl-econometrics.slack.com

Note: The service is free, so the conversations and files would not be permanent. Important conversations should be copied to this mailing list.