The best replacement for wiiflow is usb loader gx.

The best alternatives to wiiflow are rated as following:
★★★★★  usb loader gx
★★★  cfg
★★  gx
★★  usb loader
★  neogamma
★  uloader
★  wodeflow
★  configurable usb loader
★  coverfloader

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Speaking about wiiflow, one probably shouldn't forget about gamecube games.

Other search terms related to wiiflow and their ratings are:
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