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hometown
A supported fork of Mastodon that provides local posting and a wider range of content types.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
What I'd recommend is that you ask about this on the Hometown github repo (https://github.com/hometown-fork/hometown). Open an issue to put in a feature asking for admins to have the ability to restrict all users' posts to local only. I have no idea if Darius, the guy who maintains hometown, will be into the idea, but it can't hurt to ask.
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.