On: Google Groups has been left to die

[dsr_]

https://forum.dlang.org/ is a web forum.

Which is also on Usenet/NNTP.

Which is also a mailing list archive.

And also an IRC bot.

AGPL. https://github.com/CyberShadow/DFeed

[jordigh → dsr_]

It's also blazingly fast. An awesome D app.