The best replacement for bootmii is priiloader.

The best alternatives to bootmii are rated as following:
★★★★★  priiloader
★★  homebrew channel
★★  hackmii
★★  preloader
★  boot2

Your alternative for bootmii is not listed? Suggest!
Speaking about bootmii, one probably shouldn't forget about homebrew channel.

Other search terms related to bootmii and their ratings are:
★★★★★ homebrew channel
You have in mind a companion for bootmii and it is not yet here? Propose!



Google Trends

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bootmii
priiloader
homebrew channel