> In addition to mailing lists, we also use the issues on the various git
> forges as fora, and LiberaChat IRC for conversation.  It's not as slick
> as Slack, but it's not a walled garden: you get your choice of clients,
> including both persistent ones (bouncers; personally I use IRCCloud) and
> non-persistent ones.

I would very much enjoy a web app that runs on my PC and presents a
uniform interface to all the popular "Git Forges" - both commercial and
self-hosted - by interfacing to their APIs.