A directory tracking where different communities are migrating (or trying to migrate) would be awesome. With Reddit down/private I can't go on Reddit to coordinate the migration outbound.
A directory of best communities on the internet sorted and nested by topic would be great. A web directory 3.0. Whether they are on Reddit, mastodon, phpbb, discord.
Yet Another Hierarchically Organized Oracle?
Topsites 2.0: Subreddits Edition. Now federated and decentralized.