The best replacement for backbone is angular.

The best alternatives to backbone are rated as following:
★★★★★  angular
★★★★★  knockout
★★★  jquery
★★★  spine
★★★  node
★★★  angularjs
★★★  express
★★  ember
★★  bootstrap
★  backbone
★  marionette
★  extjs
★  meteor
★  react
★  spinal column
★  underscore
★  vertebral column
  dojo
  sencha
  sammy
  javascriptmvc
  canjs
  backhaul
  sproutcore
  wishbone
  chassis-based collapsed backbone
  yui
  jquery mobile
  notochord

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

Other search terms related to backbone and their ratings are:
★★★★★ rails
★★★★★ handlebars
★★★★ angular
★★★★ react
★★★ underscore
★★★ knockout
★★★ node
★★★ requirejs
★★★ marionette
★★★ django
★★★ templates
★★ bootstrap
★★ coffeescript
★★ lodash
★ require
★ browserify
★ mustache
★ jquery mobile
★ 3 fatty acids
★ node js
wishbone
laravel
You have in mind a companion for backbone and it is not yet here? Propose!



Google Trends

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