mustache - Mustache is a simple web template system with implementations available for ActionScript, C++...
Handlebars - Handlebars is a JavaScript template library that is, more or less, based on ...
Jinja2 - Jinja2 is a template engine written in Python.
Apache Velocity - Velocity is a Java-based template engine.
Pug - Pug is a robust, elegant, feature rich template engine for Node.js
JsRender - JsRender is a lightweight templating engine, highly extensible, without DOM or jQuery dependency.