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Fleet
Open-source platform for IT, security, and infrastructure teams. (Linux, macOS, Chrome, Windows, cloud, data center) (by fleetdm)
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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.
Thanks for clarifying. You may want to look into Fleet at the link below. The intent of the question wasn't to voice an opinion but to determine if any opensource solutions that cost more to support via self-hosting would incur more costs than Intune licenses if it's only for one customer.
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.