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koreader
An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Cervantes, Kindle, Kobo, PocketBook and Android devices
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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.
Everyone is providing suggestions for desktop, so I thought I'd point out koreader for android: https://github.com/koreader/koreader/
Calibre has a perfectly good epub reader, but you could try Jorkens, still under active development (I'm the developer). It has functionality you may not need, but does support annotations and highlights. It's mainly for Windows, but it's an Electron app and also mostly runs on Linux and MacOS (some work to be done on this). https://github.com/mcthulhu/jorkens