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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.
Huginn is another alternative and I see RSS but not Reddit. Could potentially still be used though.
N8N is self hosted and I just checked and they have modules for both RSS and Reddit.
NodeRed is also a good option if you do not like N8N's open-core concept.
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.