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openITCOCKPIT
openITCOCKPIT is an Open Source system monitoring tool built for different monitoring engines like Nagios, Naemon and Prometheus.
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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 was a nagios with nconf (long time not supported) die hard, however, I have recently switched to https://openitcockpit.io/ which has a great configuration web interface, it supports nagios plugins. I use pushover for mobile notifications. Monitoring windows, linux and network kit.
NOTE:
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Hence, a higher number means a more popular project.