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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.
Recently someone linked an interesting project called Takahe that supports multiple domains on one instance, so maybe someday we'll see servers that can host many accounts with their own domain names for cheap or free.
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.