The best replacement for atg is parallel.

The best alternatives to atg are rated as following:
★★★★★  parallel
★★★★  hybris
★★  biomes o plenty
★★  wtg
★★  websphere commerce
★★  parallel squats
★  wcs
★  below parallel
★  parallel squat
★  websphere
★  horse atg
★  xfr
  sterling commerce
  endeca
  gsd
  alg
  panasonic toughbook

Your alternative for atg is not listed? Suggest!
Speaking about atg, one probably shouldn't forget about biomes o plenty.

Other search terms related to atg and their ratings are:
★★★★★ biomes o plenty
★★★★ endeca
★ siebel
You have in mind a companion for atg and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of atg in all years. Click on graph for more.
atg
parallel
hybris