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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.
There's lots of dislike about nano in HN and outside for some reason but on paper it does seem to do well as a currency. https://nano.org
XLM wants to achieve some goals that are just amazing and it works so well. It is the to convert feeless and send money fast without even the one who gets the money needs to have a XLM wallet.
https://www.stellar.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.