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library
Multi-format 1D/2D barcode image processing library, usable in JavaScript ecosystem. (by zxing-js)
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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.
All My Books works fine for me. Not open source, but the license is one-time fee, not a subscription. For Windows only. Connects to openlibrary.org to get book details. Collection is a local database file
You might want to check https://openlibrary.org and its API with a web based bar code scanner e.g https://github.com/zxing-js/library then plug back to Calibre or your favorite PIM/PKM tool.
I'm the maintainer of https://github.com/MakeMonmouth/mventory/ - it's an API for managing "stuff", ostensibly parts for a makerspace but you could probably customise it to add some of the stuff you want.