The best replacement for terrain is equinox.

The best alternatives to terrain are rated as following:
★★★★★  equinox
★★★  acadia
★★  chevy equinox
★  escape
★  traverse
★  all season tires
★  encore
★  equinox 2011
★  mud terrain
★  chevrolet equinox
★  terrane
★  terrains
★  terrain
★  ford edge
★  all terrain
★  mud terrain tires
★  envoy
  equinox 2012
  ltx
  sorento
  journey
  gmc acadia
  ford escape
  outback
  honda cr v
  hyundai santa fe
  all season
  goodyear fortera
  terrain denali
  goodyear mtr
  2011 chevy equinox
  chevy traverse
  topography
  latitude
  bfg mt
  km2
  highway tires
  ground environment

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

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



Google Trends

Scale is based on the average worldwide traffic of terrain in all years. Click on graph for more.
terrain
equinox
acadia