Raiden Network is a proposed extension to Ethereum which scales-out asset transfer capacity.
It's inspired by the Lightning Network which leverages off-chain asset transfers to carry out the vast majority of transactions.
This is work in progress.
Please follow the installation instructions in the wiki.
First install the system-dependecies for a successful build of the Python packages:
brew install pkg-config libffi automakeexport PKG_CONFIG_PATH=/usr/local/Cellar/libffi/3.0.13/lib/pkgconfig/