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hornet
Discontinued HORNET is a powerful IOTA fullnode software [Moved to: https://github.com/iotaledger/hornet] (by gohornet)
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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.
IOTA has technically always been open source as there was an open source, official coordinator you could run in your own tangle.
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.