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goalert
Open source on-call scheduling, automated escalations, and notifications so you never miss a critical alert
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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.
Take a look into https://github.com/target/goalert. The devops team at Target did an excellent job of providing a very useful open source alternative to some of these other options
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.