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learn
Discontinued A social network of lifelong learners built around humanity's universal learning map.
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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.
I have been adding a number of these free books at https://learnawesome.org/
Do you really care about the format being PDF or is it about the books being FREE? I'd like to make common queries like yours easier. LearnAwesome is open-source, so of course you're free to contribute: https://github.com/learn-awesome/learn
https://github.com/EbookFoundation/free-science-books/blob/m...
Kenneth Kuttler's books doesn't seem to be there though.
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.