The OpenSCAD mailing list is a place to discuss usage, problems and development topics related to OpenSCAD.
If you wish to join the discussion see the first pinned post on the forum for instructions.
The mailing list has a Web front-end at https://lists.openscad.org/empathy/list/discuss.lists.openscad.org which is provided by the mailing list hosting company, but it's not a Forum and has a number of bugs. It is not recommended.
NOTE: The old nabble web forum at forum.openscad.org remains as read-only archive now.