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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.
Bebop. Not a bot, but delete YouTube and install Vanced
They actually are working on a similar thing, called YouTube Together. Any bot can create an invite for it, one being Activities. There might still be some bugs with it, as I don’t think it’s been officially announced (like in a blog post) let alone released for the client to make yet.
They use YouTube's API, although I don't see why they couldn't use the same system that NewPipe uses (Scrapes the information directly from the website).
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.