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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.
I discovered D2 https://github.com/terrastruct/d2 recently, and it feels really good to use. Of course, it's less used and supported, but some healthy competition can do a whole lot of good.
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.