Vue.js - Reactive Components for Modern Web Interfaces
Mustache.js - Minimal templating with {{mustaches}} in JavaScript - janl/mustache.js
Polymer - Polymer is a library that uses the latest web technologies to let you create custom HTML elements.
Vash - Vash is a template engine that offers a swift flow between code and content using Razor Syntax
Deku - Functional view library for building UI components as an alternative to React
EJS - An open source JavaScript Template library.