The best replacement for beryl is compiz.

The best alternatives to beryl are rated as following:
★★★★★  compiz
★★★  compiz fusion
★★  aero
★  topaz
★  tim
★  tantal
  hurricane beryl
  aquamarine
  xgl

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

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



Google Trends

Scale is based on the average worldwide traffic of beryl in all years. Click on graph for more.
beryl
compiz
compiz fusion