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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.
It's a waste of money and the site is praying on the ignorant, and is likely using the same free open source software anyone can - https://github.com/yt-dlp/yt-dlp/releases, or if you want a GUI https://github.com/oleksis/youtube-dl-gui/releases (and set it to use yt-ylp in settings)
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.