The best replacement for vray is mental ray.

The best alternatives to vray are rated as following:
★★★★★  mental ray
★★★★  maxwell
★★  renderman
★★  brazil
★★  arnold
★  kerkythea
★  podium
★  octane
★  keyshot
★  cycles
★  modo
★  iray
★  final render
★  vray rt
★  maxwell sketchup
  cinema 4d
  finalrender
  physical renderer
  mental ray maya
  mental ray 2013
  radiosity
  advanced render
  maxwell render
  artlantis
  lumion
  c4d
  idx renditioner
  scanline
  irender
  mentalray
  lightwave

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

Other search terms related to vray and their ratings are:
★★★★★ sketchup
★★★★ maya
★★★ revit
★★★ 3ds max
★ backburner
★ c4d
★ cinema 4d
archicad
rpc
rhino
hdri
You have in mind a companion for vray and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of vray in all years. Click on graph for more.
vray
mental ray
maxwell