CommaFeed
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CommaFeed is an open source feed file reader that may request feeds as often as every 5 seconds, and has a js;dr homepage (commafeed.com).
Open source: https://github.com/Athou/commafeed
Every 5 seconds feed requests from: 148.251.41.232 (hosted by Hetzner) as of 2017-03-17 as observed in web server logs.