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piranha.core
Piranha CMS is the friendly editor-focused CMS for .NET that can be used both as an integrated CMS or as a headless API.
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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’ve messed around with Piranha CMS before and it was quite good - i used their minimal option though, but they do offer headless
NOTE:
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Hence, a higher number means a more popular project.