The best replacement for ember is angular.

The best alternatives to ember are rated as following:
★★★★★  angular
★★★★★  backbone
★★★  ember prime
★★  nova
★★  flame charge
★★  knockout
★★  fire spin
★★  cynder
★  meteor
★  revitalizing
★  nyx
★  amber
★  angularjs
★  node
★  vapor
★  saryn
★  valkyr
★  react
★  oberon
★  durandal
★  media companion
★  pipa
  express
  fire blast
  marionette
  danny
  frost warframe
  vapor rc
  flame wheel
  nova warframe

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

Other search terms related to ember and their ratings are:
★★★★★ rails
★★★★★ node
★★★★ requirejs
★★★ react
★ meteor
★ coffeescript
rails 4
You have in mind a companion for ember and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of ember in all years. Click on graph for more.
ember
angular
backbone