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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.
I know there used to be Tootle but development seems to have stopped :/
NewCaw, a rewrite for the new version of the Twitter client Cawbird, will also have support for Mastodon. But it's sill a work in progress and have not been released yet.
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.