The best replacement for durandal is angular.

The best alternatives to durandal are rated as following:
★★★★★  angular
★★★★  ember
★★★  sammy
★  white ignis
★  shodan
  ignis

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Speaking about durandal, one probably shouldn't forget about typescript.

Other search terms related to durandal and their ratings are:
★★★★★ typescript
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Google Trends

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