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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.
Cruzbit is a minimal Bitcoin-like chain that can be GPU mined with a reasonably simple CLI. https://cruzb.it
Bitcoin is pretty easy to mine; just buy a super expensive ASIC and plug it in. https://bitcoin.org/
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.