The best replacement for nike free is vibram.

The best alternatives to nike free are rated as following:
★★★★★  vibram
★★★★★  lunar
★★★★  nike flex
★★★  new balance minimus
★★★  asics
★★  flyknit
★★  nike free run
★★  reebok realflex
★★  saucony kinvara
★  nike lunar
★  reebok nano
★  lunarglide
★  brooks pure
★  vibram five fingers
★  kinvara
★  air max
★  reebok crossfit
★  skechers go run
★  five fingers
★  adidas adipure
  vivobarefoot
  five finger
  vibram bikila
  reebok zig
  lunar glide
  inov-8
  brooks pure cadence
  new balance
  vff
  vibram five finger
  minimus

Your alternative for nike free is not listed? Suggest!
Speaking about nike free, one probably shouldn't forget about orthotics.

Other search terms related to nike free and their ratings are:
★★★★★ orthotics
★★★★ or without socks
★ no socks
You have in mind a companion for nike free and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of nike free in all years. Click on graph for more.
nike free
vibram
lunar