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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.
People not comfortable with the command line might prefer the yt-dlg version, which has a GUI frontend for it. Also available straight from the Microsoft store since I know some people struggle to figure out GitHub.
There are technical solutions to lessen the load on servers. For example, PeerTube uses a peer-to-peer broadcasting system. When watching a video, your browser tries to download it from other people who are watching it, instead of just the website's server.
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.