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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.
Great question. While the back-bone of Polkadot is Substrate, and using Substrate comes with the benefit of having a direct approach in becoming a parachain (e.g. using the Cumulus library - Parachain module) non Substrate-based chains can be deployed onto Polkadot.
NOTE:
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Hence, a higher number means a more popular project.