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streamalert
StreamAlert is a serverless, realtime data analysis framework which empowers you to ingest, analyze, and alert on data from any environment, using datasources and alerting logic you define.
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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 have a terraform module for setting up your own serverless internal Slack app with API Gateway/Lambda/SNS that I use for a couple projects. I'm actually in the process of converting it to use EventBridge instead of SNS, but I use it at work for alerting and acting on /slash-comands and Slack events.
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.