The best replacement for init is init.d.

The best alternatives to init are rated as following:
★★★★★  init.d
★★★★★  viewdidload
★★★★  upstart
★★★★  telinit
★★★  systemd
★★★  constructor
★★★  innit
★★  initwithframe
★★  initwithnibname
★★  shutdown
★★  new python
★★  initialize
★★  awakefromnib
★★  noinit
★  init servletconfig
★  page_load
★  yeoman
★  new
★  initwithcoder
★  constructor servlet
  page load
  oninit

Your alternative for init is not listed? Suggest!
Speaking about init, one probably shouldn't forget about objective c.

Other search terms related to init and their ratings are:
★★★★★ objective c
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init
init.d
viewdidload