The best replacement for imvu is second life.

The best alternatives to imvu are rated as following:
★★★★★  second life
★★★★★  zwinky
★★★  meez
★★  habbo
★★  kaneva
★  sims
★  vside
★  smallworlds
  red light center
  secondlife

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

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



Google Trends

Scale is based on the average worldwide traffic of imvu in all years. Click on graph for more.
imvu
second life
zwinky