mustache - Mustache is a simple web template system with implementations available for ActionScript, C++...
NANO – jQuery Template Engine - NANO is a simple and open-source jQuery Template Engine developed by trix.pl and released under the MIT License.
StringTemplate - StringTemplate is a java template engine for generating source code, web pages, emails, or any other formatted text output.
Pug - Pug is a robust, elegant, feature rich template engine for Node.js
Handlebars - Handlebars is a JavaScript template library that is, more or less, based on ...
Jinja2 - Jinja2 is a template engine written in Python.