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syncabook
📖🎧 A tool for creating ebooks with synchronized text and audio (EPUB3 with Media Overlays)
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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.
From searching a bit I found https://github.com/r4victor/syncabook this might help anyone intrigued about the idea. I suspect this is the tool you're talking about? Your post is really a long form question, and could have been a lot shorter.
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