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https://github.com/pipes-digital/pipes can extract feeds from pages. Pattern recognizer logic when trying the UI is a bit simple, but you can also write selectors on your own. It could work for you.
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InfluxDB
InfluxDB high-performance time series database. Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.
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https://github.com/RSS-Bridge/rss-bridge would be the default recommendation though, especially if it is for known sites.
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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.