If you like the Rails monoculture, you may like Ember as a front-end framework. Most of the choices are made for you, and on the whole they're very good default choices. If you choose Ember, you get: a CLI tool (ember-cli), a templating/rendering engine (Glimmer), a router, a persistence layer (ember-data), a unit testing tool (qunit), a server-side renderer (fastboot), etc. If you want to swap one of things out you can, but the default has great support. There have been some bumps along the way, but everything fits together and works.
