The best replacement for yumi is longbow.

The best alternatives to yumi are rated as following:
★★★★★  longbow
★★★★  xboot
★★★  universal usb installer
★★★  english longbow
★★★  uui
★★  rmprepusb
★★  unetbootin
★★  easy2boot
★★  ulrich
★  aelita
★  sardu
★  kenja
★  eugene
  long bow
  multisystem

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Speaking about yumi, one probably shouldn't forget about persistence.

Other search terms related to yumi and their ratings are:
★★★★★ persistence
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Google Trends

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yumi
longbow
xboot