The best replacement for glidecam is steadicam.

The best alternatives to glidecam are rated as following:
★★★★★  steadicam
★★★★★  merlin
★★★★  flycam
★★  blackbird
★★  shoulder rig
★  laing
★  rhino steady
★  opteka
★  flycam nano
★  steadicam merlin
★  slider
★  shoulder mount
★  varizoom
★  wieldy
★  fig rig
  flowpod
  glide gear
  steadytracker
  steadicam pilot
  merlin 2

Your alternative for glidecam is not listed? Suggest!
Speaking about glidecam, one probably shouldn't forget about follow focus.

Other search terms related to glidecam and their ratings are:
★★★★★ follow focus
★★ steadicam vest
You have in mind a companion for glidecam and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of glidecam in all years. Click on graph for more.
glidecam
steadicam
merlin