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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.
Shiny apps don't have to be hosted on a website, for what it's worth. There are ways to make them, essentially, desktop apps. Definitely quite a bit of work, but still doable.
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.