The best replacement for fglrx is xorg.

The best alternatives to fglrx are rated as following:
★★★★★  xorg
★★★★  fglrx-updates
★★★★  radeon
★  radeonhd
★  gallium
  open source driver
  radeon driver

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

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



Google Trends

Scale is based on the average worldwide traffic of fglrx in all years. Click on graph for more.
fglrx
xorg
fglrx-updates