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n8n
Free and source-available fair-code licensed workflow automation tool. Easily automate tasks across different services.
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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.
FYI: https://github.com/n8n-io/n8n
I think this is a good open source alternative: https://nodered.org/
Huginn is quite good too (and open source).
NOTE:
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Hence, a higher number means a more popular project.