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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.
Lastly there is the "i2pd way" which is a third-party project to implement an I2P router in C++. They build a portable browser bundle for Windows users too. https://github.com/PurpleI2P/i2pdbrowser/releases/tag/1.3.3 The Java and C++ developers work closely with eachother.
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.