CommaFeed
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CommaFeed is an open source feed file reader and feedreader service.
The source is open github.com/Athou/commafeed under an Apache 2.0 license.
Criticisms
commafeed.com has a js;dr homepage.
Notably bad feed polling behavior--making feed requests every 5 seconds-- from 148.251.41.232 (hosted by Hetzner) as of 2017-03-17; hits observed in web server logs.