The best replacement for bower is rokinon.

The best alternatives to bower are rated as following:
★★★★★  rokinon
★★★★★  hardwick
★★★★  npm
★★★★  grunt
★★★  nuget
★★  composer
★★  component
★★  requirejs
★★  browserify
★  cdn
★  samyang
★  jam
★  homebrew
★  vivitar
  bower
  bundler
  opteka

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

Other search terms related to bower and their ratings are:
★★★★★ browserify
★★★ gulp
★ requirejs
★ lily collins
★ grunt
★ jay severin
You have in mind a companion for bower and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of bower in all years. Click on graph for more.
bower
rokinon
hardwick