The best replacement for sass is less.

The best alternatives to sass are rated as following:
★★★★★  less
★★★  molly
★★★  scss
★★  css
★  armalite sass
★  repr
★  sass
★  stylus
★  compass
★  bootstrap
★  dpms sass
  mda
  matt wiman
  sarcasm
  schuller
  mark 12
  spss
  sassy
  mdma

Your alternative for sass is not listed? Suggest!
Speaking about sass, one probably shouldn't forget about compass.

Other search terms related to sass and their ratings are:
★★★★★ compass
★★ bootstrap 3
★★ grunt
★★ jekyll
★ brackets
★ foundation
★ express
You have in mind a companion for sass and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of sass in all years. Click on graph for more.
sass
less
molly