Mustache.js - Minimal templating with {{mustaches}} in JavaScript - janl/mustache.js
Jinja2 - Jinja2 is a template engine written in Python.
EJS - An open source JavaScript Template library.
Jtwig - Jtwig is a configurable and extensible template engine for Java.
FLAVE - Flave was created to bring ASP.
mustache - Mustache is a simple web template system with implementations available for ActionScript, C++...