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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.
PlantUML - A component that allows to write Sequence diagram, Usecase diagram, Class diagram, Object diagram, Activity diagram, Component diagram, Deployment diagram, State diagram, Timing diagram and more
Having all of them under a single roof does have its advantages, but setting them up and having the prerequisites can be a considerable task. That's where Kroki comes to the rescue. It is both an open source software that can be installed locally and a service that is free as well.
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.