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literal
Literal augments your online reading experience; capture annotations, sources, and knowledge.
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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.
Along these lines, I'm building an annotation management system, Literal, that fulfills some of your asks, specifically around collecting and annotating articles. It also does source management, and has a tagging system that would let you set up "to read" and "have read" lists. It doesn't yet do audio annotation but that's definitely on my list of things to add. It's Android only at the moment but I'd love to connect with you (or anyone else) that is interested in trying it out.