-
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 found the 'Mastering Bitcoin' book very useful https://github.com/bitcoinbook/bitcoinbook/ (Although I read it a long time ago.)
Download the source code and read it. Whenever you see a discussion about the code, use grep -r -i nsubsidy (for example) https://github.com/bitcoin/bitcoin
I've just started reading this https://github.com/jimmysong/programmingbitcoin
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.