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Fedilab
Fedilab is a multifunctional Android client to access the distributed Fediverse, consisting of microblogging, photo sharing and video hosting
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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.
Best app for Lemmy is https://f-droid.org/en/packages/com.jerboa/ / https://play.google.com/store/apps/details?id=com.jerboa&hl=en_US&gl=US&pli=1 at the moment. I use https://fedilab.app/ for Mastodon. Other Fediverse's may have different apps, check out fediverse dot party for other Fediverse instances, Pixelfed is to Instagram, PeerTube is to YouTube, etc.
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.