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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.
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lightning
Core Lightning — Lightning Network implementation focusing on spec compliance and performance
Acinq -> Eclair (using Scala)
Lightning Labs -> LND (using Go)
C-lightning is open source too: https://github.com/ElementsProject/lightning
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.