The best replacement for flexget is sickbeard.

The best alternatives to flexget are rated as following:
★★★★★  sickbeard
★★★  couchpotato
★  rssdler

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Speaking about flexget, one probably shouldn't forget about transmission.

Other search terms related to flexget and their ratings are:
★★★★★ transmission
★★★ deluge
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Google Trends

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flexget
sickbeard
couchpotato