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Jinja2 - Jinja2 is a template engine written in Python.
CSS Peeper - Smart CSS viewer tailored for Designers.
NANO – jQuery Template Engine - NANO is a simple and open-source jQuery Template Engine developed by trix.pl and released under the MIT License.
User CSS - User CSS is a browser extension that allows you to inspect style sheets from websites.
Pug - Pug is a robust, elegant, feature rich template engine for Node.js