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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.
Similar to the service of the Technical University Dresden, Germany called Dudle, there is an private and secure alternative called Nuudel, created and hosted by also German association for privacy and freedom of information called "Digitalcourage".
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.