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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.
KOReader is an alternative reader software for many platforms. It is highly configurable and more powerful than the built-in software on most devices.
Calibre is ebook library management software, akin to iTunes for ebooks. It can be used to help or automate making your books compatible or look better on your particular device.
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.