The best replacement for iboot is unibeast.

The best alternatives to iboot are rated as following:
★★★★★  unibeast
★★★★  bootrom
★★★  empire efi
★★★  rboot
★★★  chameleon
★  iatkos
★  nawcom
★  iboot legacy

Your alternative for iboot is not listed? Suggest!
Speaking about iboot, one probably shouldn't forget about mountain lion.

Other search terms related to iboot and their ratings are:
★★★★★ mountain lion
★ snow leopard
You have in mind a companion for iboot and it is not yet here? Propose!



Google Trends

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iboot
unibeast
bootrom