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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.
The closets open source alternative to Tactical RMM, I would say it's Immense Networks Remotely. It offers unattended remote access, as well as quicksupport feature like Teamviewer. It also has limited support for running scripts on one or many hosts which in effect allows doing some functions like that of Tactical RMM, however it doesn't give your same detailed device inventory as Tactical RMM, it doesn't monitor performance and you can't setup alarms as you can in TRMM. https://github.com/immense/Remotely
NOTE:
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Hence, a higher number means a more popular project.