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Closest thing to a hub is probably D&D Beyond. I also see Homebrewery turn up a lot. DM's Guild is there for people who want to sell their stuff. If you want to stick to reddit, there's /r/UnearthedArcana or /r/dndmaps.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.