Python-based SASS Compiler
RapydCSS is a wrapper around PyScss, which is a Python implementation of SASS. RapydCSS adds support for indented syntax to PyScss, which SASS already has.
To install RapydCSS simply use easy_install or pip:
pip install rapydcss
The project is GPLv3, but the output is license free. See http://www.gnu.org/licenses/gpl-faq.html#WhatCaseIsOutputGPL.