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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.
Hometown is a fork of Mastodon that adds "local only" visibility, which is what you're describing. I hope that Mastodon eventually adopts it because it's extremely useful on smaller, focused instances.
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.