Flask-Restless can be downloaded from its page on the Python Package Index. The development version can be downloaded from its page at GitHub. However, it is better to install with pip (hopefully in a virtual environment provided by virtualenv):
pip install Flask-Restless
Flask-Restless has the following dependencies (which will be automatically installed if you use pip):
Flask-Restless requires Python version 2.5, 2.6 or 2.7. Python 3 support will come when Flask has it.