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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.
Also obvious, and also only one way - sites where repository maintainers ask for feature implementation with a reward. There is no obvious winner here, both sites are good. - BountySource — payments in USD, seemingly more requests - Tip4Commit — payments in BTC, smaller amount of requests but payments are quite bigger.
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.