Onsite live chat is covered by the various and numerous Discord servers. I've been using City of Forums as a file repository, with the various Pine's builds and the new Vidiot maps.
Dev Tracker could be a bit problematic because it's not just Homecoming. You have Rebirth, /coxg, Reddit, and whatever else is out there. To keep track of all of that and in an orderly fashion would be difficult. Not impossible, but difficult. Especially as they all use different formats to release information. Reddit, Discord, forums, etc.
Ouro and Scots have server based mods covered, if that's what you mean by "mods."
Planners, well, again, City of Forums has a build workshop where people can post builds and get help. Right now, Pine's works, but .NET 3.x is a bit outdated and with .NET 5.0 out soon, it could probably stand a rewrite, especially with the source code lost. Should a new downloadable builder or planner come out, I'd be happy to host it on City of Forums, as again I've been using it as a players' file repository.