You should check out http://mithril.js.org/ http://mithril.js.org/. It's been around for a few years, it's very lightweight with a small API, not opinionated,

You should check out http://mithril.js.org/ http://mithril.js.org/. It's been around for a few years, it's very lightweight with a small API, not opinionated, and surprisingly powerful. It doesn't have all the wiz bang gadgets right of the box, but it provides the fundamentals you need for a well designed, full-fledged frontend app. I've enjoyed using it a lot the past few months on a few small projects, and I'm also using it for a larger project that I've just started working on. Oh also, I haven't even bothered with a build tool or anything yet (I find the current js build tool landscape rather dismal). Turns out it is surprisingly easy to get by with <script src="..."> lines into index.html for smaller/mid-sized apps =) The only thing I've really missed so far is SASS.