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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.
The Mastodon-compatible alternative I'm looking at the most is Takahe: https://github.com/jointakahe/takahe/
Its goal is to be lightweight and able to run on low resources and serverless infra. It also wants to support multi-domain multi-identity. Built on Django.
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.